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Figure 1.

Figure 1.

Structure and function of nicotinic acid adenine nucleotide diphosphate (NAADP). NAADP differs from β-NADP in that that the base nicotinic acid is substituted for nicotinamide (upper panel). NAADP, unlike NADP, is a potent Ca2+-mobilizing agent and activates two-pore channels in the membranes of lysosomes (lower panel).