Chains and heterogens:
PDB Chain Sequences:
>1r51A (A:) savkaarygkdnvrvykvhkdektgvqtvyemtvcvllegeietsytkadnsvivatdsi kntiyitakqnpvtppelfgsilgthfiekynhihaahvnivchrwtrmdidgkphphsf irdseekrnvqvdvvegkgidiksslsgltvlkstnsqfwgflrdeyttlketwdrilst dvdatwqwknfsglqevrshvpkfdatwatarevtlktfaednsasvqatmykmaeqila rqqlietveyslpnkhyfeidlswhkglqntgknaevfapqsdpnglikctvgrsslksk l
>1r51A (A:) savkaarygkdnvrvykvhkdektgvqtvyemtvcvllegeietsytkadnsvivatdsi kntiyitakqnpvtppelfgsilgthfiekynhihaahvnivchrwtrmdidgkphphsf irdseekrnvqvdvvegkgidiksslsgltvlkstnsqfwgflrdeyttlketwdrilst dvdatwqwknfsglqevrshvpkfdatwatarevtlktfaednsasvqatmykmaeqila rqqlietveyslpnkhyfeidlswhkglqntgknaevfapqsdpnglikctvgrss