In certain breeds of dogs , notochord cells remain ibrant in the interertebral disc into adulthood 在一些犬类，直到成年，椎间盘内的脊索细胞仍活跃。
2.
The eolutionary precursor to the backbone , the notochord is a fine , flexible chord defining the body axis in the early embryos of all ertebrates 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。
3.
Chordoma , a frequent malignant tumor of bone , is usually adult epithelial tumors arising from embryonic notochord remains of the axial skeleton 脊索瘤是发生于神经轴中线并侵及邻近骨的脊索残留物，是脊柱肿瘤中最常见的一种。
4.
Does the degree of biochemical protection notochord cells proide explain the difference in susceptibility to degeneratie disc disease between canines and humans 是否脊索细胞的生物化学保护机制提供人和犬间在椎间盘变性易感方面的差别？
5.
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 回答此问题，研究人员检查成年犬的脊索细胞，注意到他们对软骨细胞或软骨内的细胞重要基因表达有调节作用。
