CRB3 GI:28144893 crumbs 3 isoform b precursor 1 manpglglll alglpfllar wgrawgqiqt tsanenstvl psstssssdg 50 51 nlrpeaitai ivvfsllaal llavglallv rklrekrqte gtyrpsseeq 100 101 fshaaearap qdsketvqgc lpi