Fig. 2. (A-D) Expression of HrETR-1 in partial embryos derived from isolated blastomeres at the eight-cell stage. Isolated blastomere is shown in each panel. (A) Partial embryo derived from A4.1 blastomere, which has nerve cord fate. Several cells in the partial embryo express HrETR-1. (B) Partial embryo derived from a4.2 blastomere, which has brain and palp fates. No expression of HrETR-1 is observed. (C) Partial embryo derived from b4.2 blastomere. (D) Partial embryo derived from B4.1 blastomere. (E-H) Partial embryos derived from presumptive nerve cord blastomeres at the 16- (E), 24- (F), 44- (G) and 76-cell (H) stages. All express HrETR-1. In F, two partial embryos are shown. Scale bar: 100 µm.