>4louB (B:) observed residues (from ATOM records) rrrqlirqllerdktplailfmaavvgtlvglaavafdkgvawlqnqrmgalvhtadnyp llltvaflcsavlamfgyflvrkyapeaggsgipeiegaledqrpvrwwrvlpvkffggl gtlgggmvlgrqgptvqiggnigrmvldifrlkgdearhtllatgaaaglaaafnaplag ilfiieemrpqfrytlisikavfigvimstimyrifnhevalidvgklsdaplntlwlyl ilgiifgifgpifnkwvlgmqdllhrvhggnitkwvlmggaigglcgllgfvapatsggg fnlipiatagnfsmgmlvfifvarvittllcfssgapggifapmlalgtvlgtafgmvav elfpqyhleagtfaiagmgallaasirapltgiilvlemtdnyqlilpmiitglgatlla qftggkplysailartlakqea