>3pr1A (A:) observed residues (from ATOM records)
iirdvelvkvartpgdyppplkgevafvgrsnvgkssllnalfnrsinfylvnskyyfvd
lpgykermlwkrlvedyfknrwslqmvfllvdgrippqdsdlmmvewmkslnipftivlt
kmdkvkmserakkleehrkvfskygeytiiptssvtgegiselldlistllk