Table 2.

Conservation of stem cell aging in the local organ niche

	Rate of proliferation ESC/ASC (percentage of BrdU)	Myogenic differentiation ESC/ASC (percentage of desmin)
Young myofiber	60.2 ± 2.5, 40.5 ± 2.6	7.4 ± 0.9, 47.6 ± 5.0
Old myofiber	30.1 ± 4.3, 21.5 ± 4.1	1.3 ± 0.7, 19.7 ± 4.7

Quantified results from Fig. 4 are summarized and presented as mean percentages from experimental replicates ± SE. Rate of proliferation (BrdU) and myogenic differentiation (desmin) are shown for both ESCs and ASCs, in the presence of young vs. old differentiated muscle environments (young myofiber or old myofiber).