>4ns1B (B:) observed residues (from ATOM records)
qsmklqeqhyheaasflssrlpgdaktaiilgsglgelaekienktvipyneiphfaqak
gniiggilggtpvvamqgrfhyyegysmdqvtfpirvmkllgienlfvsnaaggintsfk
vgdlmiicdhinnlpnpligpnmdmfgvrfpdmtraydrefiakakgiaqelnipvkegv
yvgltgpsyetpaeykfwgqvggdaigmstvpevivarhtgirvfgmsvitnegyhfadd
fvndeqdviraanaasekmgaifarliaav