Cells exist in a three-dimensional matrix with other cells.

Between the neighboring cells together with internally generated signals and factors to ensure that the tissue shape, size shape, size and function. In the heart of development, before birth heart cells proliferate and develop into different parts of the heart. After birth, the cells no longer replicate. Although they continue to grow, making the inability to reproduce the heart is not able to regenerate cells, after they have been damaged as in myocardial infarction. It was suggested that the cardiac fibroblasts, the cells are muscle cells and are more than half of the cardiac cells may be important in embryogenesis, but little is known about their role in embryonic development and heart..

###Other authors on the study included Takatoshi Tsuchihashi and Kathryn N. Ivey of GICD, Robert S. Ross of the University of California, San Diego, and Ting-Ting Hong and Robin M. Shaw of the University of California, San Francisco.The only significant amending yam is that it it is is rotated B due to the carbon. It stopped smooth and soft. Other participants is to Jiangnan University, China.

This work was supported of the National Science Founda, the Office of Naval Research , which finance Air Force Office of Scientific Research and the National Natural Science Foundation of China.