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Left ventricular internal diameter in end-diastole (LVIDd) in wild-type (WT) and heterozygous (HT) mice of different ages. A: scattered plot of LVIDd for WT and HT in young (left) and older (right) age groups. B: scattered plot of LVIDd among older HT mice at different ages. Solid horizontal line is the average LVIDd for a WT of corresponding age. Dashed horizontal lines reflect ±1 SD of average LVIDd for WT of corresponding age.
