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We describe the phylogenetic analysis and expression pattern of the Xenopus radial spoke protein 3 (RSP3) gene during early development. The Xenopus RSP3 protein presents characteristic features of the RSP3 family. It contains a radial spoke domain, which is 75 and 72 % identical to the corresponding region of human and Chlamydomonas RSP3 proteins, respectively. Examination of the phylogenetic relationship between the Xenopus RSP3 protein and its known homologues from different deuterostomes indicates that the RSP3 proteins are highly conserved among deuterostomes. Whole-mount in situ hybridization analyses show that Xenopus RSP3 is a maternal mRNA enriched in the animal hemisphere during cleavage stages. The expression is detected in the dorsal region of the embryo during gastrulation, then in the presumptive neuroectoderm at the end of gastrulation. During neurulation and at the subsequent stages, the expression of RSP3 mRNA is detected in the entire multiciliated cells of epidermis. At tail-bud stages, it is progressively expressed in the otic vesicles and sequentially expressed in the nephrostomes. Expression could be also detected in the floor plate of the neural tube. This expression pattern persists until at least late tail-bud stages.
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