Developmental stage between the end of notochord flexion and the beginning of the juvenile stage .
介於脊索弯曲结束与稚鱼期开始之间的发育阶段。
Any animal of the phylum chordata having a notochord or spinal column .
具有脊索动物或脊椎的脊索动物门的动物。
A notochord limited to the caudal region , characteristic of the urochordates .
尾索限于尾部的脊索,有尾索动物的特征。
The evolutionary precursor to the backbone , the notochord is a fine , flexible chord defining the body axis in the early embryos of all vertebrates .
脊索是脊椎进化的前体,脊索在所有的脊椎动物胚胎早期起到柔韧轴的作用。
Preflexion larva developmental stage beginning at hatching and ending at the start of the upward flexion of the notochord .
从孵化到脊索开始向上弯曲为止的发育阶段。
For answers , the researchers examined samples of notochord cells from adult dogs , with attention to their effect on the regulation of important genes in chondrocytes , or cells found in cartilage .