Secondary Structures for Family A2
| 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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| A02.008: murine leukemia virus-type retropepsin 3SM2 |
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| A02.012: retropepsin (human T-cell leukemia virus) 2B7F |
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| A02.UPW: family A2 unassigned peptidases 1MVP |
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