Chains and heterogens:
PDB Chain Sequences:
>1ffrA (A:) aapgkptiawgntkfaivevdqaataynnlvkvknaadvsvswnlwngdtgttakvllng keawsgpstgssgtanfkvnkggryqmqvalcnadgctasdateivvadtdgshlaplke plleknkpykqnsgkvvgsyfvewgvygrnftvdkipaqnlthllygfipicggnginds lkeiegsfqalqrscqgredfkvsihdpfaalqkaqkgvtawddpykgnfgqlmalkqah pdlkilpsiggwtlsdpfffmgdkvkrdrfvgsvkeflqtwkffdgvdidwefpggkgan pnlgspqdgetyvllmkelramldqlsvetgrkyeltsaisagkdkidkvaynvaqnsmd hiflmsfdfygafdlknlghqtalnapawkpdtayttvngvnallaqgvkpgkivvgtam ygrgwtgvngyqnnipftgtatgpvkgtwengivdyrqiagqfmsgewqytydataeapy vfkpstgdlitfddarsvqakgkyvldkqlgglfsweidadngdilnsmnaslgnsagvq