>4itbB (B:) observed residues (from ATOM records)
aiatinpttgeicqrfkaltpaeidaklakaqeafqayrrtsfsqrrqwlenaaailerd
tskfaeimttemgkthqsaiaeaeksalvcryyaehgeqflaneytetqatesyvcyqpl
gillavmpwnfpfwqvfrfaapalmagnvavlkhasnvpqcalaveaileaagfpegvfq
tlligasqveqvikdprvkaatltgsepagaslaslagqeikptllelggsdpfvvfpsa
dldeavevgtvartmnngqsciaakrfilheaiaaefleklhlkfaslkigdpmapetdi
gplategilqdisrqvdqavaagakillggrpldragyfypptilteippgakilqeelf
apvamvftvkdldqaialandipfglgasawtndpaeqqrfiqeldagavfingmvksdp
rlpfggtkrsgygrelglagirtfvnaktvwlk