Chains and heterogens:
PDB Chain Sequences:
>2btfA (A:) dddiaalvvdngsgmckagfagddapravfpsivgrprhqgvmvgmgqkdsyvgdeaqsk rgiltlkypiehgivtnwddmekiwhhtfynelrvapeehpvllteaplnpkanrekmtq imfetfntpamyvaiqavlslyasgrttgivmdsgdgvthtvpiyegyalphailrldla grdltdylmkiltergysftttaereivrdikeklcyvaldfeqemataassssleksye lpdgqvitignerfrcpealfqpsflgmescgihettfnsimkcdvdirkdlyantvlsg gttmypgiadrmqkeitalapstmkikiiapperkysvwiggsilaslstfqqmwiskqe ydesgpsivhrkcf
>2btfP (P:) agwnayidnlmadgtcqdaaivgykdspsvwaavpgktfvnitpaevgilvgkdrssffv ngltlggqkcsvirdsllqdgeftmdlrtkstggaptfnitvtmtaktlvllmgkegvhg gminkkcyemashlrrsqy