Fig. 3From: Electrically stimulable indium tin oxide plate for long-term in vitro cardiomyocyte cultureStructural and morphological changes in cells during culture. a Sarcomere α-actin (red) and nuclei (blue) were stained to observe structural changes. Calculation of (b) cell area and (c) circularity. Increased cell area and decreased circularity at day 14 might indicate natural cardiomyocyte development. *, P < 0.05Back to article page