Comparative analysis of expression of the MyoD gene and m-cadherin in the myogenic precursor cells isolated from rats' muscular tissue on the 20th-21st day of embryogenesis, on the third to fifth day of postnatal development, and from adult animals was carried out. No significant differences in expression of the @MyoD@[ital] gene were observed. Nevertheless, we found that in contrast to myogenic cells isolated from postnatal muscular tissues, in the subpopulation of myoblasts isolated from embryonic tissues on the 20th-21st day of embryogenesis cells that were more progressive with respect to differentiation prevailed. These cells demonstrate little proliferative activity alongside with expression of m-cadherin, the protein responsible for cytoadherence, and, as a consequence, a higher rate of differentiation.