Receptor
PDB id Resolution Class Description Source Keywords
4KAS 1.85 Å EC: 2.1.1.148 CRYSTAL STRUCTURE OF FDTS FROM T. MARITIMA MUTANT (H53D) WIT DUMP THERMOTOGA MARITIMA THYX FDTS FAD DUMP NOVEL FDTS FOLD CONVERTION OF DUMP TUSING TETRAHYDROFOLATE AND NAD(P)HC TRANSFERASE
Ref.: FLAVIN-DEPENDENT THYMIDYLATE SYNTHASE AS A DRUG TAR DEADLY MICROBES: MUTATIONAL STUDY AND A STRATEGY FO INHIBITOR DESIGN. J BIOTERROR BIODEF V.L 12 004 2013
Ligand
Ligand Chain:Residue Validity Ligand Warnings Binding Data NGL Viewer Molecular Weight (Da) Formula SMILES
DU C:302;
A:301;
B:301;
Valid;
Valid;
Valid;
none;
none;
none;
submit data
308.182 C9 H13 N2 O8 P C1[C@...
2PE D:303;
Invalid;
none;
submit data
414.488 C18 H38 O10 C(COC...
PO4 D:302;
Invalid;
none;
submit data
94.971 O4 P [O-]P...
FAD C:301;
D:301;
Valid;
Valid;
none;
none;
submit data
785.55 C27 H33 N9 O15 P2 Cc1cc...
SO4 A:302;
B:302;
Invalid;
Invalid;
none;
none;
submit data
96.063 O4 S [O-]S...
CL C:303;
Invalid;
none;
submit data
35.453 Cl [Cl-]
View in 3D viewer
90% Homology Family
Leader
PDB id Resolution Class Description Source Keywords
5IOR 1.95 Å EC: 2.1.1.148 FLAVIN-DEPENDENT THYMIDYLATE SYNTHASE IN COMPLEX WITH FAD AN DEOXYURIDINE-5'-MONOSULFATE THERMOTOGA MARITIMA (STRAIN ATCC 43589DSM 3109 / JCM 10099) FAD-DEPENDENT NUCLEOTIDE BIOSYNTHESIS REDUCTIVE METHYLATIOTRANSFERASE
Ref.: DEPROTONATIONS IN THE REACTION OF FLAVIN-DEPENDENT THYMIDYLATE SYNTHASE. BIOCHEMISTRY V. 55 3261 2016
Members (26)
No: PDB id Binding Data Representative ligand Formula Smiles
The Class containing this family consists of a total of 6 families.
1 3G4A - UMP C9 H13 N2 O8 P C1[C@@H]([....
2 4KAT - FDA C27 H35 N9 O15 P2 Cc1cc2c(cc....
3 1O2B - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
4 4GTL - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
5 5IOT Kd = 109 uM UMP C9 H13 N2 O8 P C1[C@@H]([....
6 5IOQ Kd = 78 uM DUR C9 H12 N2 O5 C1[C@@H]([....
7 4GTA - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
8 1O2A - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
9 4KAR - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
10 1O29 - UFP C9 H12 F N2 O8 P C1[C@@H]([....
11 4GTB - D16 C21 H22 N4 O6 S CC1=NC(=O)....
12 4GTF - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
13 3N0C - UMP C9 H13 N2 O8 P C1[C@@H]([....
14 4GTD - UMP C9 H13 N2 O8 P C1[C@@H]([....
15 5IOR Kd = 0.17 uM DUS C9 H12 N2 O8 S C1[C@@H]([....
16 1O27 - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
17 4GT9 - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
18 4GTC - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
19 3G4C - UMP C9 H13 N2 O8 P C1[C@@H]([....
20 1O26 - UMP C9 H13 N2 O8 P C1[C@@H]([....
21 3N0B - UMP C9 H13 N2 O8 P C1[C@@H]([....
22 5IOS Kd = 14 uM UMP C9 H13 N2 O8 P C1[C@@H]([....
23 4KAS - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
24 1O28 - UFP C9 H12 F N2 O8 P C1[C@@H]([....
25 4GTE - MEF C20 H23 N7 O6 c1cc(ccc1C....
26 1O25 - UMP C9 H13 N2 O8 P C1[C@@H]([....
70% Homology Family (26)
No: PDB id Binding Data Representative ligand Formula Smiles
The Class containing this family consists of a total of 6 families.
1 3G4A - UMP C9 H13 N2 O8 P C1[C@@H]([....
2 4KAT - FDA C27 H35 N9 O15 P2 Cc1cc2c(cc....
3 1O2B - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
4 4GTL - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
5 5IOT Kd = 109 uM UMP C9 H13 N2 O8 P C1[C@@H]([....
6 5IOQ Kd = 78 uM DUR C9 H12 N2 O5 C1[C@@H]([....
7 4GTA - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
8 1O2A - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
9 4KAR - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
10 1O29 - UFP C9 H12 F N2 O8 P C1[C@@H]([....
11 4GTB - D16 C21 H22 N4 O6 S CC1=NC(=O)....
12 4GTF - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
13 3N0C - UMP C9 H13 N2 O8 P C1[C@@H]([....
14 4GTD - UMP C9 H13 N2 O8 P C1[C@@H]([....
15 5IOR Kd = 0.17 uM DUS C9 H12 N2 O8 S C1[C@@H]([....
16 1O27 - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
17 4GT9 - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
18 4GTC - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
19 3G4C - UMP C9 H13 N2 O8 P C1[C@@H]([....
20 1O26 - UMP C9 H13 N2 O8 P C1[C@@H]([....
21 3N0B - UMP C9 H13 N2 O8 P C1[C@@H]([....
22 5IOS Kd = 14 uM UMP C9 H13 N2 O8 P C1[C@@H]([....
23 4KAS - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
24 1O28 - UFP C9 H12 F N2 O8 P C1[C@@H]([....
25 4GTE - MEF C20 H23 N7 O6 c1cc(ccc1C....
26 1O25 - UMP C9 H13 N2 O8 P C1[C@@H]([....
50% Homology Family (27)
No: PDB id Binding Data Representative ligand Formula Smiles
The Class containing this family consists of a total of 5 families.
1 3G4A - UMP C9 H13 N2 O8 P C1[C@@H]([....
2 4KAT - FDA C27 H35 N9 O15 P2 Cc1cc2c(cc....
3 1O2B - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
4 4GTL - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
5 5IOT Kd = 109 uM UMP C9 H13 N2 O8 P C1[C@@H]([....
6 5IOQ Kd = 78 uM DUR C9 H12 N2 O5 C1[C@@H]([....
7 4GTA - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
8 1O2A - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
9 4KAR - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
10 1O29 - UFP C9 H12 F N2 O8 P C1[C@@H]([....
11 4GTB - D16 C21 H22 N4 O6 S CC1=NC(=O)....
12 4GTF - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
13 3N0C - UMP C9 H13 N2 O8 P C1[C@@H]([....
14 4GTD - UMP C9 H13 N2 O8 P C1[C@@H]([....
15 5IOR Kd = 0.17 uM DUS C9 H12 N2 O8 S C1[C@@H]([....
16 1O27 - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
17 4GT9 - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
18 4GTC - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
19 3G4C - UMP C9 H13 N2 O8 P C1[C@@H]([....
20 1O26 - UMP C9 H13 N2 O8 P C1[C@@H]([....
21 3N0B - UMP C9 H13 N2 O8 P C1[C@@H]([....
22 5IOS Kd = 14 uM UMP C9 H13 N2 O8 P C1[C@@H]([....
23 4KAS - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
24 1O28 - UFP C9 H12 F N2 O8 P C1[C@@H]([....
25 4GTE - MEF C20 H23 N7 O6 c1cc(ccc1C....
26 1O25 - UMP C9 H13 N2 O8 P C1[C@@H]([....
27 6J61 - FAD C27 H33 N9 O15 P2 Cc1cc2c(cc....
Polypharmacology
Similar Ligands (2D)
Ligand no: 1; Ligand: DU; Similar ligands found: 59
No: Ligand ECFP6 Tc MDL keys Tc
1 UMP 1 1
2 DU 1 1
3 DUD 0.8 0.985075
4 UC5 0.772727 0.970588
5 DUT 0.753623 0.985075
6 DUN 0.75 0.956522
7 DUP 0.742857 0.956522
8 DUT MG 0.694444 0.955224
9 DUS 0.692308 0.853333
10 DUR 0.683333 0.852941
11 UMP AF3 PO4 0.675676 0.876712
12 DDN 0.632353 1
13 UFP 0.591549 0.929577
14 BRU 0.583333 0.929577
15 5HU 0.583333 0.942857
16 TMP 0.583333 0.956522
17 UM3 0.57971 0.955224
18 5IU 0.575342 0.929577
19 DC 0.561644 0.928571
20 DCM 0.561644 0.928571
21 BVP 0.531646 0.942857
22 DU DU DU DU BRU DU DU 0.53125 0.864865
23 U 0.527778 0.911765
24 U5P 0.527778 0.911765
25 DDU 0.523077 0.753623
26 UMC 0.520548 0.941176
27 QBT 0.493333 0.927536
28 DUA 0.487805 0.783784
29 DU3 0.487805 0.780822
30 5CM 0.481013 0.890411
31 DU4 0.47619 0.76
32 TYD 0.469136 0.942857
33 YYY 0.451219 0.915493
34 UDP 0.45 0.898551
35 TTP 0.447059 0.942857
36 8OG 0.435294 0.835443
37 U2P 0.434211 0.884058
38 U3P 0.434211 0.897059
39 UA3 0.434211 0.897059
40 UTP 0.433735 0.898551
41 44P 0.43038 0.914286
42 DCP 0.430233 0.915493
43 U5F 0.428571 0.898551
44 0KX 0.425287 0.890411
45 DUX 0.411765 0.756757
46 2KH 0.411765 0.873239
47 UMF 0.410256 0.84507
48 UPU 0.409091 0.871429
49 F6G 0.409091 0.876712
50 TTP MG 0.409091 0.914286
51 139 0.409091 0.8
52 URI 0.408451 0.771429
53 TBD 0.406977 0.90411
54 DU DU DU DU BRU DA DU 0.40625 0.771084
55 PUA 0.405172 0.833333
56 UNP 0.402299 0.873239
57 UAD 0.4 0.873239
58 PUP 0.4 0.955882
59 UDX 0.4 0.873239
Ligand no: 2; Ligand: FAD; Similar ligands found: 147
No: Ligand ECFP6 Tc MDL keys Tc
1 FAS 1 1
2 FAD 1 1
3 FAY 0.859259 0.9875
4 RFL 0.852941 0.963855
5 UBG 0.845588 0.987654
6 6FA 0.794118 0.987654
7 FAE 0.751773 0.987654
8 SFD 0.651007 0.860215
9 FDA 0.641892 0.906977
10 FNK 0.602564 0.876405
11 JNT 0.598425 0.876543
12 FAJ 0.57485 0.97561
13 62F 0.572327 0.939024
14 F2N 0.566265 0.886364
15 FMN 0.543307 0.876543
16 FA9 0.526316 0.939759
17 6YU 0.516304 0.860215
18 CNV FAD 0.511905 0.908046
19 P6G FDA 0.511628 0.908046
20 FAD NBT 0.508876 0.83871
21 A2D 0.504065 0.875
22 DAL FAD PER 0.491429 0.836957
23 P5F 0.491329 0.941176
24 FAD CNX 0.488506 0.8125
25 APR 0.488372 0.851852
26 AR6 0.488372 0.851852
27 FAD T2C 0.485876 0.819149
28 AGS 0.484615 0.811765
29 M33 0.484375 0.864198
30 BA3 0.484127 0.875
31 ATP 0.48062 0.851852
32 HEJ 0.48062 0.851852
33 B4P 0.480315 0.875
34 ADP 0.480315 0.851852
35 AP5 0.480315 0.875
36 ANP 0.477273 0.831325
37 5FA 0.476923 0.851852
38 AQP 0.476923 0.851852
39 48N 0.469388 0.902439
40 OAD 0.467626 0.876543
41 9X8 0.467626 0.833333
42 FAD NBA 0.467033 0.793814
43 GTA 0.465753 0.892857
44 AT4 0.465116 0.821429
45 AN2 0.465116 0.841463
46 HQG 0.463235 0.841463
47 AD9 0.462121 0.831325
48 3OD 0.460993 0.876543
49 RBF 0.460938 0.790123
50 FB0 0.460606 0.835165
51 139 0.460526 0.858824
52 AP0 0.46 0.835294
53 A22 0.459854 0.864198
54 ACP 0.458015 0.853659
55 8QN 0.456522 0.864198
56 PRX 0.454545 0.831325
57 A3R 0.453237 0.86747
58 A1R 0.453237 0.86747
59 G3A 0.452055 0.902439
60 T5A 0.45098 0.872093
61 G5P 0.44898 0.902439
62 ATF 0.448529 0.821429
63 50T 0.44697 0.819277
64 OZV 0.446043 0.851852
65 6YZ 0.445255 0.853659
66 ACQ 0.444444 0.853659
67 ADQ 0.442857 0.853659
68 PAJ 0.442857 0.847059
69 KMQ 0.441379 0.843373
70 8LE 0.441176 0.855422
71 5AL 0.441176 0.864198
72 ADX 0.439394 0.775281
73 CA0 0.439394 0.853659
74 8LQ 0.438849 0.865854
75 QA7 0.438849 0.855422
76 A4P 0.437909 0.831461
77 25L 0.4375 0.864198
78 P33 FDA 0.436464 0.817204
79 KG4 0.43609 0.853659
80 5SV 0.435714 0.793103
81 8LH 0.434783 0.843373
82 OMR 0.434211 0.818182
83 TXE 0.434211 0.890244
84 45A 0.434109 0.829268
85 ABM 0.434109 0.829268
86 AMP 0.433071 0.82716
87 A 0.433071 0.82716
88 4AD 0.432624 0.855422
89 ADJ 0.432258 0.818182
90 B5M 0.431507 0.878049
91 B5Y 0.431507 0.878049
92 BIS 0.430556 0.802326
93 DJC FAD 0.43 0.827957
94 SRA 0.429688 0.788235
95 AFH 0.42953 0.825581
96 DND 0.427632 0.865854
97 TXD 0.427632 0.890244
98 UP5 0.427632 0.878049
99 6V0 0.427632 0.857143
100 DQV 0.426667 0.8875
101 SRP 0.42446 0.843373
102 PR8 0.423611 0.837209
103 TAT 0.423358 0.821429
104 T99 0.423358 0.821429
105 AMO 0.422535 0.865854
106 PTJ 0.42069 0.835294
107 TXA 0.42069 0.865854
108 FYA 0.42069 0.864198
109 CNA 0.420382 0.865854
110 AHX 0.41958 0.835294
111 00A 0.41958 0.823529
112 AMP MG 0.418605 0.814815
113 MAP 0.41844 0.811765
114 NAI 0.418301 0.845238
115 AU1 0.41791 0.831325
116 A12 0.416667 0.843373
117 AP2 0.416667 0.843373
118 9ZD 0.415493 0.845238
119 25A 0.415493 0.851852
120 9ZA 0.415493 0.845238
121 COD 0.415094 0.842697
122 4TC 0.412903 0.879518
123 APC 0.411765 0.843373
124 ME8 0.410959 0.806818
125 1ZZ 0.410959 0.806818
126 NB8 0.410959 0.835294
127 ADP BEF 0.410448 0.82716
128 ADP MG 0.410448 0.82716
129 DJ0 FAD 0.41 0.865169
130 4UW 0.409091 0.825581
131 NAX 0.409091 0.837209
132 F2R 0.408805 0.850575
133 ADV 0.408759 0.843373
134 RBY 0.408759 0.843373
135 VO4 ADP 0.407143 0.809524
136 P1H 0.405882 0.818182
137 BEF ADP 0.405797 0.807229
138 OOB 0.405594 0.864198
139 LAD 0.40411 0.825581
140 UPA 0.403846 0.86747
141 4UU 0.401316 0.833333
142 GA7 0.401316 0.865854
143 A3D 0.401235 0.876543
144 80F 0.401235 0.808989
145 DLL 0.4 0.864198
146 XAH 0.4 0.806818
147 V2G 0.4 0.857143
Similar Ligands (3D)
Ligand no: 1; Ligand: DU; Similar ligands found: 94
No: Ligand Similarity coefficient
1 C 0.9730
2 CAR 0.9723
3 C5P 0.9681
4 FDM 0.9649
5 UP6 0.9647
6 H2U 0.9629
7 DOC 0.9620
8 9L3 0.9598
9 CH 0.9596
10 FN5 0.9596
11 NYM 0.9580
12 PSU 0.9530
13 16B 0.9517
14 BMP 0.9504
15 TKW 0.9502
16 5FU 0.9490
17 5BU 0.9458
18 D4M 0.9437
19 2DT 0.9437
20 BMQ 0.9431
21 NUP 0.9400
22 U6M 0.9325
23 C2R 0.9313
24 S5P 0.9295
25 DI 0.9277
26 DA 0.9275
27 D5M 0.9275
28 AMP 0.9269
29 PFU 0.9242
30 T3S 0.9242
31 NMN 0.9234
32 NCN 0.9224
33 AIR 0.9223
34 NIA 0.9194
35 AMZ 0.9180
36 FNU 0.9175
37 IMP 0.9168
38 6MA 0.9138
39 U4S 0.9134
40 5HM 0.9130
41 ATM 0.9120
42 6CN 0.9112
43 FMP 0.9092
44 CNU 0.9077
45 AS 0.9077
46 7D5 0.9028
47 IRP 0.9020
48 MTE 0.8992
49 5GP 0.8989
50 IRN 0.8979
51 AZU 0.8977
52 5QT 0.8965
53 8BR 0.8959
54 CMP 0.8957
55 8OP 0.8950
56 DG 0.8948
57 DGP 0.8948
58 VKE 0.8917
59 6AU 0.8904
60 OMP 0.8878
61 JW5 0.8877
62 6SY 0.8869
63 GAR 0.8867
64 2T4 0.8854
65 NEC 0.8836
66 PZB 0.8833
67 71V 0.8832
68 N5O 0.8825
69 RP1 0.8825
70 G 0.8822
71 TXS 0.8794
72 GO1 0.8790
73 XMP 0.8768
74 SP1 0.8761
75 TWB 0.8748
76 CDP 0.8746
77 MTA 0.8718
78 MTH 0.8714
79 8GM 0.8663
80 15I 0.8654
81 3N4 0.8651
82 CC7 0.8650
83 IGP 0.8638
84 MTM 0.8634
85 VIB 0.8625
86 6G7 0.8611
87 CTN 0.8597
88 1CE 0.8583
89 4X2 0.8582
90 DCZ 0.8572
91 FAI 0.8570
92 9RK 0.8558
93 F95 0.8547
94 22T 0.8531
Ligand no: 2; Ligand: FAD; Similar ligands found: 1
No: Ligand Similarity coefficient
1 FDA T2C 0.8610
Similar Binding Sites (Proteins are less than 50% similar to leader)
Pocket No.: 1; Query (leader) PDB : 5IOR; Ligand: DUS; Similar sites found with APoc: No similar binding sites found, or similarity not calculated due to duplicate pocket.
This union binding pocket(no: 1) in the query (biounit: 5ior.bio1) has 146 residues
No: Leader PDB Ligand Sequence Similarity
Pocket No.: 2; Query (leader) PDB : 5IOR; Ligand: DUS; Similar sites found with APoc: No similar binding sites found, or similarity not calculated due to duplicate pocket.
This union binding pocket(no: 2) in the query (biounit: 5ior.bio1) has 146 residues
No: Leader PDB Ligand Sequence Similarity
Pocket No.: 3; Query (leader) PDB : 5IOR; Ligand: DUS; Similar sites found with APoc: No similar binding sites found, or similarity not calculated due to duplicate pocket.
This union binding pocket(no: 3) in the query (biounit: 5ior.bio1) has 146 residues
No: Leader PDB Ligand Sequence Similarity
Pocket No.: 4; Query (leader) PDB : 5IOR; Ligand: DUS; Similar sites found with APoc: No similar binding sites found, or similarity not calculated due to duplicate pocket.
This union binding pocket(no: 4) in the query (biounit: 5ior.bio1) has 146 residues
No: Leader PDB Ligand Sequence Similarity
Pocket No.: 5; Query (leader) PDB : 5IOR; Ligand: FAD; Similar sites found with APoc: No similar binding sites found, or similarity not calculated due to duplicate pocket.
This union binding pocket(no: 5) in the query (biounit: 5ior.bio1) has 146 residues
No: Leader PDB Ligand Sequence Similarity
Pocket No.: 6; Query (leader) PDB : 5IOR; Ligand: FAD; Similar sites found with APoc: No similar binding sites found, or similarity not calculated due to duplicate pocket.
This union binding pocket(no: 6) in the query (biounit: 5ior.bio1) has 146 residues
No: Leader PDB Ligand Sequence Similarity
Pocket No.: 7; Query (leader) PDB : 5IOR; Ligand: FAD; Similar sites found with APoc: No similar binding sites found, or similarity not calculated due to duplicate pocket.
This union binding pocket(no: 7) in the query (biounit: 5ior.bio1) has 146 residues
No: Leader PDB Ligand Sequence Similarity
Pocket No.: 8; Query (leader) PDB : 5IOR; Ligand: FAD; Similar sites found with APoc: No similar binding sites found, or similarity not calculated due to duplicate pocket.
This union binding pocket(no: 8) in the query (biounit: 5ior.bio1) has 146 residues
No: Leader PDB Ligand Sequence Similarity
Pocket No.: 9; Query (leader) PDB : 5IOR; Ligand: RBF; Similar sites found with APoc: No similar binding sites found, or similarity not calculated due to duplicate pocket.
This union binding pocket(no: 9) in the query (biounit: 5ior.bio1) has 147 residues
No: Leader PDB Ligand Sequence Similarity
Pocket No.: 10; Query (leader) PDB : 5IOR; Ligand: RBF; Similar sites found with APoc: No similar binding sites found, or similarity not calculated due to duplicate pocket.
This union binding pocket(no: 10) in the query (biounit: 5ior.bio1) has 147 residues
No: Leader PDB Ligand Sequence Similarity
Pocket No.: 11; Query (leader) PDB : 5IOR; Ligand: RBF; Similar sites found with APoc: No similar binding sites found, or similarity not calculated due to duplicate pocket.
This union binding pocket(no: 11) in the query (biounit: 5ior.bio1) has 147 residues
No: Leader PDB Ligand Sequence Similarity
Pocket No.: 12; Query (leader) PDB : 5IOR; Ligand: RBF; Similar sites found with APoc: No similar binding sites found, or similarity not calculated due to duplicate pocket.
This union binding pocket(no: 12) in the query (biounit: 5ior.bio1) has 147 residues
No: Leader PDB Ligand Sequence Similarity
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