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。