[Regression in the ovary of Myxine glutinosa L. (Cyclostomata). IV. Histochemical studies of atretic follicles].

Within the atretic follicles of Myxine glutinosa neither 3 beta-hydroxysteroiddehydrogenase, being in close relation to steroid production, nor cholesterol was found. The proofs of aryl sulphatase activity and acid phosphatase activity gave positive results in all cell types of the atretic follicle. A very strong reaction was observed in the granulosa cells and the migrating cells of the atretic follicle of the closed involutionary type.