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Fig. 2. Immunohistochemical localization of lamprey parapinopsin in the pineal
organ. (A) Lamprey parapinopsin immunoreactivity is localized in the outer
segment of the dorsal and peripheral photoreceptor cells of the pineal organ.
A weak immunoreaction is observed in the cell bodies and the basal processes.
(B) The lamprey parapinopsin immunoreactivity is localized in the pineal
stalk. (C) In the parapineal organ, lamprey parapinopsin immunoreactivity is
mainly localized in the dorsal region. (D) In control staining for lamprey
parapinosin, no immunoreactivity was observed. l, lumen. Scale bars, 100
µm.