Abstract

AbstractThe satellite cell population in mouse lumbrical muscle is quantitated at ages 7, 14, 21 and 30 days. Satellite cell nuclei comprise nearly 30% of the nuclei within the fiber basal lamina in the youngest animals studied. Growth is accompanied by a rapid decrease in the percentage of satellite cell nuclei. This is not accounted for by the increase in myonuclei, but rather there is an absolute decrease in the number of satellite cells. This loss in satellite cells occurs in spite of their high rate of division and is explained by a high percentage incorporation of the daughter cells of satellite divisions. It is further suggested that the percent incorporation of available cells decreases with age.

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