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Sizes of different regions of the heart between wild type (Wt), heterozygotes (Ht), and homozygote mutants (Hm). The left ventricle weight includes both the septum and the free wall. Only the atrial sizes were significantly different between the homozygous mutants and the other genetic groups. Wt, N=6; Ht, N=7; Hm, N=6.
