“…L azarus et al [1968] found that the granulocytes also pro duce it. Slansky et al [1968Slansky et al [ , 1970a and M cC ulley et al [1970] demon strated the collagenase activity of the corneal epithelial cells. According to Brown et al [1969Brown et al [ , 1970b, the stromal cells also produce the enzyme.…”