The pineal gland of the mole (Talpa europaea L.) III. A fluorescence histochemical study

The pineal gland of the mole, a mammal which lives in permanent darkness, has been studied using fluorescence histochemistry. An extensive catecholaminergic innervation is demonstrated. A yellow formaldehyde-induced fluorescence, characteristic of indoleamines, was not observed. If formaldehyde vapour treatment was omitted in the procedure, numerous cells containing yellow-orange autofluorescent material could be shown. The nature and possible function of this material is discussed.