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Proliferation rate of cultures from control and mutant mice. Primary calvarial cells were isolated from the SmoM2;OCN-Cre mutant or the control at 2 weeks of age. The cells were incubated in GM. Proliferation levels were measured at 24 h and 72 h of incubation. ***P < 0.01 vs. the cultures of 24 h incubation. NS, not significant.
