- Two myogenin-related genes are differentially expressed in Xenopus laevis myogenesis and differ in their ability to transactivate muscle structural genes. Charbonnier, F., Gaspera, B.D., Armand, A.S., Van der Laarse, W.J., Launay, T., Becker, C., Gallien, C.L., Chanoine, C. J. Biol. Chem. (2002)