Chains and heterogens:
PDB Chain Sequences:
>1km4A (A:) vmnrlilamdlmnrddalrvtgevreyidtvkigyplvlsegmdiiaefrkrfgcriiad favadipetnekicratfkagadaiivhgfpgadsvraclnvaeemgrevflltemshpg aemfiqgaadeiarmgvdlgvknyvgpstrperlsrlreiigqdsflispgvgaqggdpg etlrfadaiivgrsiyladnpaaaaagiiesi