>1s3xA (A:) observed residues (from ATOM records)
kaaaigidlgttyscigvfqhgkveiiandqgnrttpsyvaftdterligdaaknqvaln
pqntvfdakrligrkfgdpvvqsdmkhwpfqvindgdkpkvqvsykgetkafypeeissm
vltkmkeiaeaylgypvtnavitvpayfndsqrqatkdagviaglnvlriineptaaaia
ygldrtgkgernvlifdlgggtfdvsiltiddgifevkatagdthlggedfdnrlvnhfv
eefkrkhkkdisqnkravrrlrtacerakrtlssstqasleidslfegidfytsitrarf
eelcsdlfrstlepvekalrdakldkaqihdlvlvggstripkvqkllqdffngrdlnks
inpdeavaygaavqaailmg