Fig. 4. tec29 is required for microfilament ring contraction during cellularization. (A,B) Projections of confocal sections of the cellularization front after it has passed the nuclear bases of a wild-type (A) and a tec29^k00206 germline clone (B) embryo. Embryos were stained with antibody to myosin. The microfilament rings of wild-type embryos during late cellularization are round and constricted (A), whereas the microfilament rings of tec29 germline clone mutant embryos are less rounded and are not constricted (B). Scale bar: 10 µm.