>4lw2B (B:) observed residues (from ATOM records)
nvfnpaqfraqfpalqdagvyldsaatalkpeavveatqqfyslsagnvhrsqfaeaqrl
taryeaarekvaqllnapddktivwtrgttesinmvaqcyarprlqpgdeiivsvaehha
nlvpwlmvaqqtgakvvklplnaqrlpdvdllpelitprsrilalgqmsnvtggcpdlar
aitfahsagmvvmvdgaqgavhfpadvqqldidfyafsghklygptgigvlygksellea
mspwlgggkmvhevsfdgfttqsapwkleagtpnvagviglsaalewladydinqaesws
rslatlaedalakrpgfrsfrcqdssllafdfagvhhsdmvtllaeygialragqhcaqp
llaelgvtgtlrasfapyntksdvdalvnavdralellv