Chains and heterogens:
PDB Chain Sequences:
>1gn4A (A:) aeytlpdldwdygalephisgqinelhhskhhatyvkgandavakleearakedhsaill neknlafnlaghvnhtiwwknlspnggdkptgelaaaiadafgsfdkfraqfhaaattvq gsgwaalgwdtlgnkllifqvydeqtnfplgivplllldmwehafylqyknvkvdfakaf wnvvnwadvqsryaaats
>1gn4B (B:) aeytlpdldwdygalephisgqinelhhskhhatyvkgandavakleearakedhsaill neknlafnlaghvnhtiwwknlspnggdkptgelaaaiadafgsfdkfraqfhaaattvq gsgwaalgwdtlgnkllifqvydeqtnfplgivplllldmwehafylqyknvkvdfakaf wnvvnwadvqsryaaats
>1gn4C (C:) aeytlpdldwdygalephisgqinelhhskhhatyvkgandavakleearakedhsaill neknlafnlaghvnhtiwwknlspnggdkptgelaaaiadafgsfdkfraqfhaaattvq gsgwaalgwdtlgnkllifqvydeqtnfplgivplllldmwehafylqyknvkvdfakaf wnvvnwadvqsryaaats
>1gn4D (D:) aeytlpdldwdygalephisgqinelhhskhhatyvkgandavakleearakedhsaill neknlafnlaghvnhtiwwknlspnggdkptgelaaaiadafgsfdkfraqfhaaattvq gsgwaalgwdtlgnkllifqvydeqtnfplgivplllldmwehafylqyknvkvdfakaf wnvvnwadvqsryaaats