Contact with the epidermal cells of Health dentate processes, and mutual chimera. 表皮細胞接觸處密生齒狀突起,且互相嵌合。
Even in today's machines, contact with tubing can damage cells, or they may be sheared or crushed by the roller pumps. 然而即使是現在的機型,細胞接觸到管子也會受損,或者受到滾筒式幫浦的拉扯或擠壓。