The figure shows IGF-IEa mRNA levels in Achilles tendon (A) and IGF-I isoforms (IEa, IEb and IEc) and IGF-IR mRNA levels in calf muscle (B). Mice with low GH/IGF-I activity (GHR−/−, grey bars, tendon: n=8, muscle: n=15) or high GH/IGF-I activity (bGH, black bars, tendon: n=7, muscle: n=14) are shown relative to control mice (CTRL, only error bars visible, tendon: n=12, muscle: n=24). All data are relative to GAPDH mRNA. IGF-IR = IGF-I receptor. Values are geometric mean ± back-transformed SEM (**p<0.01; ***p<0.001, only differences compared to control are shown).