>3ch1A (A:) observed residues (from ATOM records)
gphsmryfetavsrpgleepryisvgyvdnkefvrfdsdaenpryeprapwmeqegpeyw
eretqkakgqeqwfrvslrnllgyynqsaggshtlqqmsgcdlgsdwrllrgylqfayeg
rdyialnedlktwtaadmaaqitrrkweqsgaaehykaylegecvewlhrylkngnllrt
dspkahvthhprskgevtlrcwalgfypaditltwqlngeeltqdmelvetrpagdgtfq
kwasvvvplgkeqnytcrvyheglpepltlrwep