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Body weight of Npt2+/+, Npt2+/−, and Npt2−/− mice as a function of age. Normal mice and their mutant littermates were weighed between 3 weeks and 6 months of age. Each point represents mean ± SD derived from 4 to 30 measurements. Npt2+/+ (○), Npt2+/− (▿), and Npt2−/− (⋄) mice.
