Relative expression of synaptic genes in transgenic muscles. The expression levels of the various genes tested are given as percentages of their expression levels in wild-type muscle. Error bars correspond to the standard deviation. Analysis of variance was performed using a one-way ANOVA (P < 0.01 for AChR α and ε, AChE, utrophin A and β2 laminin. Variations of MuSK, Rapsyn and utrophin B expression were not found to be significant). AChR α and ε, acetylcholine receptor subunit gene α and ε; AChE, acetylcholinesterase.