Secondary Structures for Clan AA
| A01.001: pepsin A 1PSO |
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| A01.006: chymosin 4CMS |
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| A01.007: renin 2REN |
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| A01.009: cathepsin D 1LYB |
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| A01.011: penicillopepsin 1BXO |
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| A01.021: plasmepsin (Plasmodium sp.) 1QS8 |
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| A01.023: plasmepsin-2 1SME |
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| A02.001: HIV-1 retropepsin 5HVP |
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| A02.002: HIV-2 retropepsin 4UPJ |
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| A02.004: equine infectious anaemia virus retropepsin 1FMB |
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| A02.UPW: family A2 unassigned peptidases 1MVP |
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| A09.001: spumapepsin 2JYS |
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| A28.001: DNA-damage inducible protein 1 2I1A |
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