>1pr3A (A:) observed residues (from ATOM records)
mknvgfigwrgmvgsvlmdrmsqendfenlnpvffttsqalksafdieelkkldiivtcq
ggdytnevypklkatgwdgywvdaasalkmkddaiivldpvnqhviseglkkgiktfvgg
nctvslmlmaigglfekdlvewisvatyqaasgagaknmrellsqmglleqavsselkdp
assildierkvtakmradnfptdnfgaalggslipwidkllpetgqtkeewkgyaetnki
lglsdnpipvdglcvrigalrchsqaftiklkkdlpleeieqiiashnewvkvipndkei
tlreltpakvtgtlsvpvgrlrklamgpeylaaftvgdqllwgaaepvrrilkqlva