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Fig. 2. Immunocytochemical demonstration of recoverin in the pineal organ of various vertebrates, a,b: larvae of Xenopus laevis (stage 61
according to Nieuwkoop and Faber 21 }, frontal sections. Arrowheads, recoverin immunoreactive perikarya of pineal photoreceptors cells; double
arrows, meningeal melanophores; Ill, third ventricle, c: pigeon. Recoverin immunoreaction occurs mainly in structures (*) protruding into the
lumen of the pineal follicles and resembling irregular outer segments of modified pineal photoreceptors, d,e: albino rat. Recoverin immunoreaction
is restricted to scattered pinealocytes (arrowheads) mainly located in the periphery of the pineal organ (PO). Surrounding brain regions, e.g.
the occipital cortex (PC) and the superior colliculi (SC) are immunonegative. Some pinealocytes display recoverin-immunoreactive processes
(arrows). f: rabbit. Recoverin-immunoreactive pinealocytes are more numerous than in the rat, but are also found mainly in the periphery of the
pineal organ. Strongly labeled cells can be distinguished from weakly stained or immunonegative elements. Arrows, recoverin immunoreactive
processes of pinealocytes. Magnification: a x 200; b x 630; c,e × 400; d × 50; f × 1,800. For further details see Materials and Methods |
