Once a cell enters, say, the valley that leads to becoming a skincell, it cannot suddenly change course and become a neuron.
一个细胞一旦落入某条峡谷，比如成为皮肤细胞，那么它就不可能突然改变轨迹，而变为神经细胞。
2
A handful of genes that are normally active in the developing embryo are expressed in a differentiated cell, such as a skincell, causing that cell to revert back to its undifferentiated state.
一些通常在发育胚胎中活跃的基因会被分化细胞(比如皮肤细胞)表达，促使细胞回复到未分化状态。
3
When not blocked by peptide 15-1, hyaluronan fragments bind to skincell receptors and set off a signaling cascade that increases inflammation at the site of the injury.