>4r2nB (B:) observed residues (from ATOM records)
vtarlrpelaglpvyvpgktvpgaiklasnetvfgplpsvraaidratdtvnrypdngcv
qlkaalarhlgpdfapehvavgcgsvslcqqlvqvtasvgdevvfgwrsfelyppqvrva
gaipiqvpltdhtfdlyamlatvtdrtrlifvcnpnnptstvvgpdalarfveavpahil
iaideayveyirdgmrpdslglvrahnnvvvlrtfskayglaglrigyaighpdvitald
kvyvpftvssigqaaaiasldaadellartdtvvaerarvsaelraagftlppsqanfvw
lplgsrtqdfveqaadarivvrpygtdgvrvtvaapeendaflrfarrwrsdq