Chains and heterogens:
PDB Chain Sequences:
>1n90A (A:) aaeqyqgaasavdpahvvrtngapdmsesefneakqiyfqrcagchgvlrkgatgkpltp ditqqrgqqylealitygtplgmpnwgssgelskeqitlmakyiqhtppqppewgmpemr eswkvlvkpedrpkkqlndldlpnlfsvtlrdagqialvdgdskkivkvidtgyavhisr msasgryllvigrdaridmidlwakeptkvaeikigiearsvesskfkgyedrytiagay wppqfaimdgetlepkqivstrgmtvdtqtyhpeprvaaiiashehpefivnvketgkvl lvnykdidnltvtsigaapflhdggwdsshryfmtaannsnkvavidskdrrlsalvdvg ktphpgrganfvhpkygpvwstshlgdgsisligtdpknhpqyawkkvaelqgqgggslf ikthpksshlyvdttfnpdarisqsvavfdlknldakyqvlpiaewadlgegakrvvqpe ynkrgdevwfsvwngkndssalvvvddktlklkavvkdprlitptgkfnvyntqhdvy
>1n90B (B:) kaaeqyqgaasavdpahvvrtngapdmsesefneakqiyfqrcagchgvlrkgatgkplt pditqqrgqqylealitygtplgmpnwgssgelskeqitlmakyiqhtppqppewgmpem reswkvlvkpedrpkkqlndldlpnlfsvtlrdagqialvdgdskkivkvidtgyavhis rmsasgryllvigrdaridmidlwakeptkvaeikigiearsvesskfkgyedrytiaga ywppqfaimdgetlepkqivstrgmtvdtqtyhpeprvaaiiashehpefivnvketgkv llvnykdidnltvtsigaapflhdggwdsshryfmtaannsnkvavidskdrrlsalvdv gktphpgrganfvhpkygpvwstshlgdgsisligtdpknhpqyawkkvaelqgqgggsl fikthpksshlyvdttfnpdarisqsvavfdlknldakyqvlpiaewadlgegakrvvqp eynkrgdevwfsvwngkndssalvvvddktlklkavvkdprlitptgkfnvyntqhdvy