Ultrastructural examination of intercardiomyocyte space, mitochondria, and gap junctions. Ultrastructural examination of intercardiomyocyte space (A and B), mitochondria (C and D), and gap junctions (E and F). A, C, and E are from the control mice and B, D, and F from the alcoholic mice. See text for details. Note that compared to the control (A), in mice drinking alcohol (B) not only capillaries with loose pericapillary spaces (*) are more frequently seen, but the individual cardiomyocytes are smaller. Arrows in E and F indicate gap junctions. Images A and B are of the same magnification; C through F are of the same magnification. Bar in B, 10 μm; in F, 1 μm.