>1q20A (A:) observed residues (from ATOM records)
sdiseisqklpgeyfrykgvpfpvglyslesislaentqdvrdddifiitypksgttwmi
eiiclilkegdpswirsvpiwerapwcetivgafslpdqysprlmsshlpiqiftkaffs
skakviymgrnprdvvvslyhyskiagqlkdpgtpdqflrdflkgevqfgswfdhikgwl
rmkgkdnflfityeelqqdlqgsvericgflgrplgkealgsvvahstfsamkantmsny
tllppslldhrrgaflrkgvcgdwknhftvaqseafdrayrkqmrgmptfpwde