Fig. 8. Defined expression classes based on developmental concepts reveal an inflection point in the transition from maternal to embryonic control. (A) A Venn diagram relating by area the relative sizes and intersections of the four basis classes. The number of genes in each class is in parentheses. (B) Gene expression profiles for the average of each of the defined expression classes. Each gene was mean normalized before computing the class average. The heavy black line labeled ANOVA plots the average of all genes with P<0.01 in either of the two within-series ANOVAs, and is included as a point of reference. M, maternal; E, embryonic,; ET, embryonic transient; MD, maternal degradation; S, strictly (e.g. SE implies E but not M; SMD implies MD but not E).

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