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In Drosophila oocytes, gurken mRNA localization orientates the TGF-alpha signal to establish the anteroposterior and dorsoventral axes. We have elucidated the path and mechanism of gurken mRNA localization by time-lapse cinematography of injected fluorescent transcripts in living oocytes. gurken RNA assembles into particles that move in two distinct steps,… (More)
In Drosophila, the formation of the embryonic axes is initiated by Gurken, a transforming growth factor alpha signal from the oocyte to the posterior follicle cells, and an unknown polarising signal back to the oocyte. We report that Drosophila Merlin is specifically required only within the posterior follicle cells to initiate axis formation. Merlin… (More)
An m(k) (-)r(k) (-) mutation exerted no measurable effect on 5-bromouracil incorporation by a thymineless derivative of Escherichia coli K.