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Fig. 8 Initiation of muscle regeneration is not affected by the absence of pax7 and pax3. Transgenic expression of Pax3a:GFP (green) and incorporation of BrdU (red) in A-F wt (n = 16), G-L, pax7a−/−/7b−/− double mutant (n = 15) and, M-R, pax3a−/−/7a−/−/7b−/− triple mutant (n = 13) zebrafish embryos injured at somite number 10 at 4 dpf shown at A,D,G,J,M,P 1 dpi, B,E,H,K,N,Q, 2 dpi, and, C,F,I,L,O,R, 3 dpi. Average number of Pax3a:GFP+, BrdU+ and Pax3:GFP/BrdU double positive cells per somite at 1, 2, and 3 dpi is presented in S-U. Error bars indicate SEM and significance was calculated using Student's t-test where P < .05 was considered significant. Arrowheads indicate area of injury. Scale bar: 100 μm