>4bttF (F:) observed residues (from ATOM records)
ivggqeckdgecpwqallineenegfcggtilsefyiltaahclyqakrfkvrvgdrnte
qeeggeavhevevvikhnrftketydfdiavlrlktpitfrmnvapaclperdwaestlm
tqktgivsgfgrthekgrqstrlkmlevpyvdrnscklsssfiitqnmfcagydtkqeda
cqgdsggphvtrfkdtyfvtgivswgegcarkgkygiytkvtaflkwidrsmktr