>4btlB (B:) observed residues (from ATOM records)
edpqllvrvrggqlrgirlkapggpvsaflgipfaeppvgsrrfmppepkrpwsgvldat
tfqnvcyqyvdtlypgfegtemwnpnrelsedclylnvwtpyprpasptpvliwiygggf
ysgaasldvydgrflaqvegavlvsmnyrvgtfgflalpgsreapgnvglldqrlalqwv
qeniaafggdpmsvtlfgesagaasvgmhilslpsrslfhravlqsgtpngpwatvsage
arrratllarlvgcgndteliaclrtrpaqdlvdhewhvlpqesifrfsfvpvvdgdfls
dtpealintgdfqdlqvlvgvvkdegsyflvygvpgfskdneslisraqflagvrigvpq
asdlaaeavvlhytdwlhpedpthlrdamsavvgdhnvvcpvaqlagrlaaqgarvyayi
fehrastltwplwmgvphgyeiefifglpldpslnytteerifaqrlmkywtnfartgdp
ndprdskspqwppyttaaqqyvslnlkplevrrglraqtcafwnrflpkllsat