The angle of the dorsoventral axis with respect to the anteroposterior axis in the Drosophila embryo is controlled by the distribution of gurken mRNA in the oocyte.

Abstract excerpt

Like most organisms, Drosophila embryos develop in relation to two orthogonal axes, the anteroposterior and dorsoventral. These two axes are established by four independent systems of maternal information. Mutations in any system disrupt either the anteroposterior or the dorsoventral patterning of the embryo but never affect the orthogonal orientation of the axes relative to each other. Here we show by analyzing...

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