Chains and heterogens:
PDB Chain Sequences:
>2r4uA (A:) mqvlhvcsemfpllktggladvigalpaaqiadgvdarvllpafpdirrgvtdaqvvsrr dtfaghitllfghyngvgiylidaphlydrpgspyhdtnlfaytdnvlrfallgwvgaem asgldpfwrpdvvhahdwhaglapaylaargrpaksvftvhnlayqgmfyahhmndiqlp wsffnihglefngqisflkaglyyadhitavsptyareitepqfaygmegllqqrhregr lsgvlngvdekiwspetdlllasrytrdtledkaenkrqlqiamglkvddkvplfavvsr ltsqkgldlvlealpglleqggqlallgagdpvlqegflaaaaeypgqvgvqigyheafs hrimggadvilvpsrfepcgltqlyglkygtlplvrrtggladtvsdcslenladgvasg fvfedsnawsllrairrafvlwsrpslwrfvqrqamamdfswqvaaksyrelyyrlkleh hhhhh
>2r4uA (A:) mqvlhvcsemfpllktggladvigalpaaqiadgvdarvllpafpdirrgvtdaqvvsrr dtfaghitllfghyngvgiylidaphlydrpgspyhdtnlfaytdnvlrfallgwvgaem asgldpfwrpdvvhahdwhaglapaylaargrpaksvftvhnlayqgmfyahhmndiqlp wsffnihglefngqisflkaglyyadhitavsptyareitepqfaygmegllqqrhregr lsgvlngvdekiwspetdlllasrytrdtledkaenkrqlqiamglkvddkvplfavvsr ltsqkgldlvlealpglleqggqlallgagdpvlqegflaaaaeypgqvgvqigyheafs hrimggadvilvpsrfepcgltqlyglkygtlplvrrtggladtvsdcslenladgvasg fvfedsnawsllrairrafvlwsrpslwrfvqrqamamdfswqvaaksyrelyyrlk