Chains and heterogens:
PDB Chain Sequences:
>1nn2A (A:) veyrnwskpqcqitgfapfskdnsirlsaggdiwvtrepyvscdpvkcyqfalgqgttld nkhsndtvhdriphrtllmnelgvpfhlgtrqvciawsssschdgkawlhvcitgddkna tasfiydgrlvdsigswsqnilrtqesecvcingtctvvmtdgsasgradtrilfieegk ivhisplagsaqhveecscyprypgvrcicrdnwkgsnrpvvdinmedysidssyvcsgl vgdtprnddrssnsncrdpnnergtqgvkgwafdngndlwmgrtiskdlrsgyetfkvig gwstpnsksqinrqvivdsdnrsgysgifsvegkscinrcfyvelirgrkqetrvwwtsn sivvfcgtsgtygtgswpdganinfmpi