>1bt7_ (-) observed residues (from ATOM records)
tgrdknqvegevqvvstatqsflatcvngvcwtvyhgagsktlagpkgpitqmytnvdqd
lvgwqappgarsltpctcgssdlylvtrhadvipvrrrgdsrgsllsprpvsylkgssgg
pllcpsghavgifraavctrgvakavdfvpvesmettmraskkkk