>4porB (B:) observed residues (from ATOM records)
vevlevrtgpdaitqieaylnprmgnnnptdelygysadinvasskasdnpnattlptys
vaviklpmlnedmtcdtllmweavsvktevmgisslvnlhqggkyiygsssgtipvqgtt
lhmfsvggeplelqglvasstttyptdmvtiknmkpvnqaldpnakalldkdgkypvevw
spdpsknentryygsftggattppvmqftnsvttvlldengvgplckgdklflsavdivg
ihtnysesqnwrglpryfnvtlrkrvvknp