Chains and heterogens:
PDB Chain Sequences:
>1i99E (E:) ivggytcqensvpyqvslnsgyhfcggslindqwvvsaahcyksriqvrlgehninvleg neqfvnaakiikhpnfdrktlnndimliklsspvklnarvatvalpsscapagtqclisg wgntlssgvnepdllqcldapllpqadceasypgkitdnmvcvgfleggkdscqgdaggp vvcngelqgivswgygcalpdnpgvytkvcnyvdwiqdtiaan
>1i99I (I:) getdlqkilresndqftaqmfsevvkanpgqnvvlsafsvlpplgqlalasvgeshdell ralalpndnvtkdvfadlnrgvravkgvdlkmaskiyvakglelnddfaavsrdvfgsev qnvdfvksveaagainkwvedqtnnriknlvdpdaldettrsvlvnaiyfkgswkdkfvk ertmdrdfhvskdktikvptmigkkdvryadvpeldakmiemsyegdqasmiiilpnqvd gitaleqklkdpkalsraeerlynteveitlpkfkietttdlkevlsnmnikklftpgaa rlenllktkesltvdaaiqkafievneegaeaaaanafgivpkslilypevhidrpfyfe lkidgipmfngkviep