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Medical Definition of Tail bud
1. The rapidly proliferating mass of cells at the caudal extremity of the embryo; remnant of the primitive node. Synonym: end bud. (05 Mar 2000)
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1. The rapidly proliferating mass of cells at the caudal extremity of the embryo; remnant of the primitive node. Synonym: end bud. (05 Mar 2000)