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Fig. 23. Schematic diagram of signaling pathways for vitellogenin gene expression via cyclic nucleotides in ovary. Gi, inhibitory G protein; Gs, stimulatory G protein; PDE, phosphodiesterase; PKA, protein kinase A; PKG, protein kinase G, 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. 4, © 2008, Fisheries Research Agency, Japan.

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