>4ixtB (B:) observed residues (from ATOM records)
staivtnvkhfggmgsalrlseaghtvachdesfkhqdeleafaetypqlipmseqepve
lieavtsalghvdilvsndiapvewrpidkyavedyrdmvealqikpfalanavasqmkr
rksghiifitsaasfgpwkelstyasaragasalanalskelgehnipvfaiapngvdsg
dspyyypsepwktspehvawvrkytalqrlgtqkelgelvtflasgscdyltgqvfwlag
gfpvv