Chains and heterogens:
PDB Chain Sequences:
>1gn3A (A:) maeytlpdldwdygalephisgqinelhhskhhatyvkgandavakleearakedhsail lneknlafnlaghvnhtiwwknlspnggdkptgelaaaiadafgsfdkfraqfhaaattv qgsgwaalgwdtlgnkllifqvydqqtnfplgivplllldmwehafylqyknvkvdfaka fwnvvnwadvqsryaaatsqtkglifg
>1gn3A (A:) aeytlpdldwdygalephisgqinelhhskhhatyvkgandavakleearakedhsaill neknlafnlaghvnhtiwwknlspnggdkptgelaaaiadafgsfdkfraqfhaaattvq gsgwaalgwdtlgnkllifqvydqqtnfplgivplllldmwehafylqyknvkvdfakaf wnvvnwadvqsryaaats
>1gn3B (B:) maeytlpdldwdygalephisgqinelhhskhhatyvkgandavakleearakedhsail lneknlafnlaghvnhtiwwknlspnggdkptgelaaaiadafgsfdkfraqfhaaattv qgsgwaalgwdtlgnkllifqvydqqtnfplgivplllldmwehafylqyknvkvdfaka fwnvvnwadvqsryaaatsqtkglifg
>1gn3B (B:) aeytlpdldwdygalephisgqinelhhskhhatyvkgandavakleearakedhsaill neknlafnlaghvnhtiwwknlspnggdkptgelaaaiadafgsfdkfraqfhaaattvq gsgwaalgwdtlgnkllifqvydqqtnfplgivplllldmwehafylqyknvkvdfakaf wnvvnwadvqsryaaats