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Fig. 24. Schematic diagram of signaling pathways for vitellogenin gene expression via calcium ion and protein kinase C (PKC) in ovary. DAG, diacylglycerol; ER, endoplasmic reticulum; G, G protein; IP3, inositol 1,4,5-triphosphate; PIP2, phosphatidylinositol bisphosphate; VIH, vitellogenesis-inhibiting hormone. "+" and "–" indicate stimulatory and inhibitory effects, respectively. Reprinted with permission from Bulletin of Fisheries Resesarch Agency, 26, Okumura, Intracellular signaling pathways for vitellogenin synthesis in the ovary of the kuruma prawn, Penaeus (Marsupenaeus) japonicus, 135–141, Fig. 5, © 2008, Fisheries Research Agency, Japan.

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