>1u4fB (B:) observed residues (from ATOM records)
srfvkkdghcnvqfinvgenetlvfshnaviamrdgklclmwrvgnlrkshlveahvraq
llksritsegeyipldqidinvgfdsgidriflvspitivheidedsplydlskqdidna
dfeivvilegmveatamttqcrssylaneilwghryepvlfeekhyykvdysrfhktyev
pntplcsardlaekk