Force generation (mN/cm2) was quantified for the superior rectus muscles of naïve control, placebo injection control, and FGF2-treated muscles one week after (A) 500 ng FGF2 injections for 3 consecutive days, (B) 1 µg FGF2 injections for 3 consecutive days, (C) 5 µg FGF2 injections for 3 consecutive days, and (D) 2 weeks after injection of 5 µg FGF2 injections for 3 consecutive days. * Statistical difference from naïve control superior rectus muscle. # Statistical difference from contralateral saline-injected control superior rectus muscle.