>1s3sF (F:) observed residues (from ATOM records)
kqknrpnrlivdeainednsvvslsqpkmdelqlfrgdtvllkgkkrreavcivlsddtc
sdekirmnrvvrnnlrvrlgdvisiqpcpdvkygkrihvlpiddtvegitgnlfevylkp
yfleayrpirkgdiflvrggmravefkvvetdpspycivapdtvihcegepikredeees
lnevgyddvggcrkqlaqikemvelplrhpalfkaigvkpprgillygppgtgktliara
vanetgaffflingpeimsklagesesnlrkafeeaeknapaiifideldaiapkrekth
geverrivsqlltlmdglkqrahvivmaatnrpnsidpalrrfgrfdrevdigipdatgr
leilqihtknmkladdvdleqvanethghvgadlaalcseaalqairkkmdlidledeti
daevmnslavtmddfrwalsq