bud

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References in periodicals archive ?
Type 2, in which only the tail bud fails to develop and the true notochord remains unaffected (interference only with secondary neurulation).
These genes are initially expressed in the involuting mesoderm of the gastrula, then in the differentiating somites of the neurula, followed by the differentiating notochord and finally in the tail bud of the 10-somite stage embryo (15).