Lasers in Surgery and Medicine 25:456 (1999) Erratum Oliveira NML, Parizzotto NA, Salvini TF. GaAs (904-Nm) laser radiation does not affect muscle regeneration in mouse skeletal muscle. Lasers in Surgery and Medicine, 1999;25:13–21. The description of GaAs laser irradiation (page 15, second paragraph) was incorrectly described. The correct description is: We used a pulsed GaAs laser of 904-Nm wavelength, impulse duration of 200 ns, frequency of 1,000 Hz, peak power of 20 W, average power output of 4 mW, intensity of 0.02 W/cm2, and spot of 0.2 cm2. The time of irradiation for each laser application was 2.5 minutes (group 3 J/cm2) and 8.3 minutes (group 10 J/cm2), and was automatically controlled by the laser equipment. The author regrets the error. © 1999 Wiley-Liss, Inc.