>6iw4B (B:) observed residues (from ATOM records)
ahcigitdrdfiegvhggtwvsatleqdkcvtvmapdkpsldisletvaidrpaevrkvc
ynavlthvkindkcpstgeahlaeenegdnackrtysdrgwgngcglfgkgsivacakft
caksmslfevdqtkiqyviraqlhvgakqenwntdiktlkfdalsgsqevefigygkatl
ecqvqtavdfgnsyiaemeteswivdrqwaqdltlpwqsgsggvwremhhlvefepphaa
tirvlalgnqegslktaltgamrvtkdtlyklhgghvscrvklsaltlkgtsykictdkm
ffvknptdtghgtvvmqvkvskgapcripvivaddltaainkgilvtvnpiastnddevl
ievnppfgdsyiivgrgdsrltyqwhke