>1ctnA (A:) observed residues (from ATOM records)
aapgkptiawgntkfaivevdqaataynnlvkvknaadvsvswnlwngdtgttakillng
keawsgpstgssgtanfkvnkggryqmqvalcnadgctasdateivvadtdgshlaplke
plleknkpykqnsgkvvgsyfvewgvygrnftvdkipaqnlthllygfipicggnginds
lkeiegsfqalqrscqgredfkisihdpfaalqkaqkgvtawddpykgnfgqlmalkqah
pdlkilpsiggwtlsdpfffmgdkvkrdrfvgsvkeflqtwkffdgvdidwefpggkgan
pnlgspqdgetyvllmkelramldqlstetgrkyeltsaisagkdkidkvaynvaqnsmd
hiflmsydfygafdlknlghqtalnapawkpdtayttvngvnallaqgvkpgkivvgtam
ygrgwtgvngyqnnipftgtatgpvkgtwengivdyrqiagqfmsgewqytydataeapy
vfkpstgdlitfddarsvqakgkyvldkqlgglfsweidadngdilnsmnaslgnsag