| Family | Cys IV | Sequences | 3D Structures |
| | # | Organisms | NMR | X-Ray | Organisms |
| All families | | 3320 | 654 | 198 | 16 | 97 |
| Agouti-related |
61 |
339 |
158 |
5 |
0 |
2 |
| Alpha-amylase inhibitor |
61 |
1 |
1 |
5 |
2 |
4 |
| Algae |
61 |
3 |
1 |
0 |
0 |
0 |
| Bacteria |
61 |
14 |
9 |
0 |
0 |
0 |
| Bug |
61 |
3 |
3 |
2 |
0 |
2 |
| Ciliate |
61 |
2 |
1 |
0 |
0 |
0 |
| Conotoxin1 |
61 |
957 |
79 |
38 |
0 |
12 |
| Conotoxin2 |
78 |
10 |
8 |
3 |
0 |
3 |
| Conotoxin3 |
77 |
2 |
2 |
0 |
0 |
0 |
| Cyclotide |
78 |
277 |
37 |
34 |
1 |
10 |
| Fungi1 |
77 |
83 |
35 |
0 |
0 |
0 |
| Fungi2 |
61 |
71 |
46 |
0 |
0 |
0 |
| Gurmarin-like |
61 |
1 |
1 |
2 |
0 |
1 |
| Horseshoe crab |
61 |
5 |
1 |
3 |
0 |
1 |
| Insect1 |
61 |
15 |
6 |
1 |
0 |
1 |
| Insect2 |
61 |
71 |
36 |
0 |
0 |
0 |
| Maize |
78 |
9 |
2 |
0 |
0 |
0 |
| Carboxypeptidase inhibitor |
77 |
43 |
9 |
2 |
1 |
2 |
| Mycetozoa |
61 |
1 |
1 |
0 |
0 |
0 |
| Plant antimicrobial |
61 |
23 |
12 |
2 |
0 |
2 |
| Plant defensin |
63 |
4 |
1 |
1 |
0 |
1 |
| Plant toxin |
78 |
82 |
20 |
3 |
0 |
3 |
| Plant toxin2 |
78 |
0 |
0 |
1 |
0 |
1 |
| Scorpion1 |
63 |
16 |
14 |
2 |
0 |
1 |
| Scorpion2 |
61 |
61 |
20 |
4 |
0 |
4 |
| Serine protease inhibitor1 |
78 |
42 |
19 |
12 |
12 |
12 |
| Serine protease inhibitor2 |
61 |
5 |
2 |
0 |
0 |
0 |
| Serine protease inhibitor3 |
61 |
5 |
2 |
0 |
0 |
0 |
| Spider |
61 |
975 |
71 |
72 |
0 |
32 |
| Sponge |
61 |
1 |
1 |
4 |
0 |
2 |
| Trematoda |
61 |
110 |
6 |
0 |
0 |
0 |
| Trichoplax |
61 |
1 |
1 |
0 |
0 |
0 |
| Virus1 |
61 |
35 |
13 |
2 |
0 |
1 |
| Virus2 |
61 |
49 |
33 |
0 |
0 |
0 |
| Water flea |
61 |
4 |
3 |
0 |
0 |
0 |
