Chains and heterogens:
PDB Chain Sequences:
>1gagA (A:) ssvfvpdewevsrekitllrelgqgsfgmvyegnardiikgeaetrvavktvnesaslre rieflneasvmkgftchhvvrllgvvskgqptlvvmelmahgdlksylrslrpeaennpg rppptlqemiqmaaeiadgmaylnakkfvhrdlaarncmvahdftvkigdfgmtrdiyet dyyrkggkgllpvrwmapeslkdgvfttssdmwsfgvvlweitslaeqpyqglsneqvlk fvmdggyldqpdncpervtdlmrmcwqfnpkmrptfleivnllkddlhpsfpevsffhse enk