Chains and heterogens:
PDB Chain Sequences:
>2r4tA (A:) mqvlhvcsemfpllktggladvigalpaaqiadgvdarvllpafpdirrgvtdaqvvsrr dtfaghitllfghyngvgiylidaphlydrpgspyhdtnlfaytdnvlrfallgwvgaem asgldpfwrpdvvhahdwhaglapaylaargrpaksvftvhnlayqgmfyahhmndiqlp wsffnihglefngqisflkaglyyadhitavsptyareitepqfaygmegllqqrhregr lsgvlngvdekiwspetdlllasrytrdtledkaenkrqlqiamglkvddkvplfavvsr ltsqkgldlvlealpglleqggqlallgagdpvlqegflaaaaeypgqvgvqigyheafs hrimggadvilvpsrfepcgltqlyglkygtlplvrrtggladtvsdcslenladgvasg fvfedsnawsllrairrafvlwsrpslwrfvqrqamamdfswqvaaksyrelyyrlkleh hhhhh
>2r4tA (A:) mqvlhvcsemfpllktggladvigalpaaqiadgvdarvllpafpdirrgvtdaqvvsrr dtfaghitllfghyngvgiylidaphlydrpgspyhdtnlfaytdnvlrfallgwvgaem asgldpfwrpdvvhahdwhaglapaylaargrpaksvftvhnlayqgmfyahhmndiqlp wsffnihglefngqisflkaglyyadhitavsptyareitepqfaygmegllqqrhregr lsgvlngvdekiwspetdlllasrytrdtledkaenkrqlqiamglkvddkvplfavvsr ltsqkgldlvlealpglleqggqlallgagdpvlqegflaaaaeypgqvgvqigyheafs hrimggadvilvpsrfepcgltqlyglkygtlplvrrtggladtvsdcslenladgvasg fvfedsnawsllrairrafvlwsrpslwrfvqrqamamdfswqvaaksyrelyyrlk