Chains and heterogens:
PDB Chain Sequences:
>1f42A (A:) iwelkkdvyvveldwypdapgemvvltcdtpeedgitwtldqssevlgsgktltiqvkef gdagqytchkggevlshsllllhkkedgiwstdilkdqkepknktflrceaknysgrftc wwlttistdltfsvkssrgssdpqgvtcgaatlsaervrgdnkeyeysvecqedsacpaa eeslpievmvdavhklkyenytssffirdiikpdppknlqlkplknsrqvevsweypdtw stphsyfsltfcvqvqgkskrekkdrvftdktsatvicrknasisvraqdryyssswsew asvpcs
>1f42A (A:) iwelkkdvyvveldwypdapgemvvltcdtpeedgitwtldqssevlgsgktltiqvkef gdagqytchkggevlshsllllhkkedgiwstdilkdqkepknktflrceaknysgrftc wwlttistdltfsvkssrggvtcgaatlsaervrgdnkeyeysvecqedsacpaaeeslp ievmvdavhklkyenytssffirdiikpdppknlqlkplknsrqvevsweypdtwstphs yfsltfcvqvqgkskrrvftdktsatvicrknasisvraqdryyssswsewasvpcs