>3x25A (A:) observed residues (from ATOM records)
enaapaqapvsdrawalfraldgkglvpdgyvegwkktfeedfsprrgaelvarawtdpe
frqllltdgtaavaqygylgpqgeyivavedtptlknvivcslcsctawpilglpptwyk
sfeyrarvvreprkvlsemgteiasdieirvydttaetrymvlpqrpagtegwsqeqlqe
ivtkdcligvaipqvpt