Fig. 1. Src64, Tec29 and anillin localization in wild-type and src64 mutants during cellularization. Cross-sections of a wild-type (A) and a src64¹⁷ mutant (B) embryo, and sagittal sections of wild-type (C,E,G) and src64¹⁷ mutant (D,F,H) embryos during cellularization. Embryos were stained with antibodies to Src64 (A,B), Tec29 (C,D), phosphotyrosine (E,F) and anillin (G,H). (A) Src64 protein localizes predominantly to the cellularization front in wild-type embryos but is absent in src64¹⁷ mutant embryos (B). (C,D) Tec29 localizes strongly to the cellularization front and less strongly to the apico-lateral membrane in both wild-type and src64 embryos. (E,F) Phosphotyrosine-containing proteins localize to the cellularization front in both wild-type embryos and src64 embryos. (G,H) Anillin localizes to the cellularization front in both wild-type and src64 embryos. Scale bar: 10 µm.