In certain breeds of dogs, notochord cells remain vibrant in the intervertebral disc into adulthood.
在一些犬类,直到成年, 椎间盘内的脊索细胞仍活跃.
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Free-swimming larva of ascidians; they have a tail like a tadpole that contains the notochord.
自由游动的海鞘类幼体;它们有含有脊索的蝌蚪形尾巴。
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将胚胎发育主要分为4个时期:卵裂期、原肠脊索与体腔中胚层形成期、胎膜形成期和器官发生期;
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