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Fig. 5. Caspase-8 and caspase-9 activities in myoblasts during differentiation. Myoblasts were transfected with either control vector (C), wtIGFBP-5 (wtBP5) or mutIGFBP-5 (mutBP5) and (A) caspase-8, and (B) caspase-9 activities were determined in cell lysates during differentiation; means±s.e.m., n=3; data are expressed as a fraction of control values; significance that mean is less than 1.0: *P<0.05; **P<0.01.