Fig. 1

A cross-section (a) and a lateral-section (b) of regenerated muscle fibers from confetti-fluorescent mice. A five-month-old male (a) and female (b) mice were injected with 100 μ g/g tamoxifen on 5 consecutive days to achieve transgene recombination. Ten days after the last tamoxifen injection, muscle injury was induced by injecting the tibialis anterior with 50 μ l 10 μ M cardiotoxin. Sixteen days after injury mice were sacrificed, the tibialis anterior was fixed and frozen, and 10 μ m sections were cut. Scalebars are 50 μ m