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Fig. 5. Mesoderm spreading is initiated in the absence of MAPK activation. Cross
sections of embryos stained for Twist to reveal the development of the
mesoderm (brown). (A) A wild-type embryo. (B) A homozygous
dof1 mutant embryo. (C-F) Mesoderm development in embryos
derived from germline mutant clones lacking both the maternal and zygotic
function of (C) Dsor1LH110, (D)
Ras85Dc40B, (E) cswE(sev)1A-eOP and
(F) dShc13G.