>4n2yA (A:) observed residues (from ATOM records)
mkqlilaldvmdgekameiakkvaehvdrikvnyplvlsagvgimkrlseikpviadfki
advpytssliariafensaesvivhgfvgsdtlrevcrvaeefggkvyavtelsspggee
fmsavslkivekakeagchgliapstrierlreirkaagdmeilcpgigaqkgsieavky
adgiivgrgiyasgnpaeearklrrvlki