The difference between the posterior and anterior signals Nusslein-Volhard et al., Science 238, 1675-1681
Distinct Properties of the signals Anterior signal-instructive. Induces polarity at site of injection. Posterior signal-permissive. Polarity independent of injection site.
Evidence for Bicoid Rescue activity spatially distributed Amount of rescue dependent on amount injected Linear relationship between gene dose and rescue activity mRNA asymmetrically localized and protein expressed in a gradient
Bicoid rescue assay Nusslein-Volhard et al., Science 238, 1675-1681
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