>2tunB (B:) observed residues (from ATOM records) tpsdkpvahvvanpqaegqlqwlnrranallangvelrdnqlvvpseglyliysqvlfkg qgcpsthvllthtisrivvsyqtkvnllsaikspcqretpegaeakpwyepiylggvfql ekgdrlsaeinrpdyllfaesgqvyfgiial