TABLE 1.

Statistical analysis of 5-min data for experiments with immorto⁺ cell lines (Fig. 2)

ERK	Cell line	Mean ± S.E.	n	p versus controla
ERK2 (p42)	WT	1.57 ± 0.12	6	0.0051
	Lrp4−/−	0.80 ± 0.06	3	0.0794
	MuSK−/−	0.69 ± 0.05	4	0.0085
ERK1 (p44)	WT	1.37 ± 0.09	6	0.0118
	Lrp4−/−	0.81 ± 0.07	3	0.1132
	MuSK−/−	0.83 ± 0.05	4	0.0425

^a One sample t test was used to compare means at 5 min versus means at 0 min, which were normalized at 1.