. "al potential) that produce lateral ectoderm; however the difference between the two of them is that P creates bigger batches of dorsolateral epidermis than O.[14] The sludgeworm Tubifex, unlike the leech, specifies the O and P lineages early in development and therefore, these two cells are not equipotent.[18] Each segment of the body of the leech is generated from one M, O, P cell types and two N" . . .