>2f6lB (B:) observed residues (from ATOM records)
tsqlaelvdaaaerlevadpvaafkwraqlpiedsgrveqqlaklgedarsqhidpdyvt
rvfddqirateaieysrfsdwklnpasappeppdlsasrsaidslnnrmlsqiwshwsll
sapscaaqldrakrdivrsrhldslyqralttatqsycqalppa