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Nrarp is a novel intracellular component of the Notch signaling pathway in Xenopus. Shown here is a whole-mount in situ hybridization analysis of a neural plate stage Xenopus embryo using a probe directed against the neuronal marker
-tubulin (dark blue). In Xenopus, Notch signaling negatively regulates the number of primary neurons that form in the neural plate through the process of lateral inhibition. At the two-cell stage, the embryo shown was injected in the animal pole with Nrarp RNA. Overexpression of Nrarp (top, inset) induces the formation of additional primary neurons, suggesting that Nrarp negatively regulates Notch signaling. (For details, see Lamar et al., p. 1885.)