>4katB (B:) observed residues (from ATOM records)
hmkidildkgfvelvdvmgndlsavraarvsfdmglkdeerdrhlieylmkhghetpfeh
ivftfhvkapifvarqwfrhriasynelsgrysklsyefyipsperlegykttippervt
ekiseivdkayrtyleliesgvprevarivlplnlytrffwtvnarslmnflnlkadsha
qweiqqyalaiarifkekcpwtfeaflkyaykgdilkevq