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Fig. 2. (A) Quantitative real-time PCR to assess M-CAM expression in fetal tissue. The different amplification curves demonstrate diverse M-CAM cDNA content at the three time points. Mb, myoblasts; E, L Mt, early and late myotubes. GAPDH was used as internal control. Each PCR reaction was performed in duplicate. (B) Downregulation of M-CAM RNA during myoblast fusion as determined by real-time quantitative PCR analysis. The fold change value (y axis) in the late myotubes sample was arbitrarily set as 1 and the fold change values in early myotubes and myoblasts were plotted accordingly. (C) Agarose gel of PCR products after amplification. Sequence analysis confirmed that the band corresponds to M-CAM. M, molecular size markers. Lane 1, myoblasts; lane 3, early myotubes; lane 5, late myotubes; lanes 2, 4, and 6 are water controls for each reaction.