MAPK1 and triple-A syndrome: AAA size positively correlated with the level of activated p42 (ERK1) (Figure 7(c), Spearman's correlation r = 0.5711, p < 0.01, n = 24) and activated p44 (ERK2) (Figure 7(d), Spearman's correlation r = 0.4949, p < 0.01, n = 24).