Fig. 2.

Satellite cells (Pax7⁺ cells) per myonuclei. A: number of Pax7⁺ cells expressed per number of myonuclei (in %) in muscle biopsies (vastus lateralis muscles) obtained before (pre) and 8 days after maximal eccentric exercise (no block and NSAID) from the vastus lateralis muscle. Both legs performed the exercise; in one leg, the NSAID was infused during the exercise day (NSAID leg). Data are means ± SE; n = 5 complete sets. B: immunohistochemical staining with the use of Pax7 antibody to identify satellite cells on a muscle cross-section (7 μm) taken 8 days after exercise. For illustration, the area shown is relatively densely populated with satellite cells. Bottom image shows two of the satellite cells at higher magnification. Scale bar = 50 μm.