Chains and heterogens:
PDB Chain Sequences:
>1na7A (A:) msgpvpsrarvytdvnthrpreywdyashvvewgnqddyqlvrklgrgkysevfeainit nnekvvvkilkpvkknkikreikilenlrggpniitladivkdpvsrtpalvfehvnntd fkqlyqtltdydirfymyeilkaldychsmgimhrdvkphnvmidhehrklrlidwglae fyhpgqeynvrvasryfkgpellvdyqmydysldmwslgcmlasmifrkepffhghdnyd qlvriakvlgtedlydyidkynieldprfndilgrhsrkrwerfvhsenqhlvspealdf ldkllrydhqsrltareamehpyfytvvk
>1na7A (A:) pvpsrarvytdvnthrpreywdyashvvewgnqddyqlvrklgrgkysevfeainitnne kvvvkilkpvkknkikreikilenlrggpniitladivkdpvsrtpalvfehvnntdfkq lyqtltdydirfymyeilkaldychsmgimhrdvkphnvmidhehrklrlidwglaefyh pgqeynvrvasryfkgpellvdyqmydysldmwslgcmlasmifrkepffhghdnydqlv riakvlgtedlydyidkynieldprfndilgrhsrkrwerfvhsenqhlvspealdfldk llrydhqsrltareamehpyfytvvk