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Homogenates were prepared from livers, brains and testes of adult Pisd+/+ (hatched bars) and Pisd+/− (solid bars) mice. PS decarboxylase activity was measured in vitro. Data are means ± S.D. from at least three mice of each genotype. For liver and brain: *, p < 0.001; for testis: *, p = 0.012.
