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Figure Caption
Figure 1—figure supplement 1. The allotetraploid X. laevis genome contains two distinct subgenomes “L” and “S” due to interspecific hybridization of ancestral diploids. (B) Triptolide inhibits genome activation, as measured in the late blastula, while cycloheximide inhibits only secondary activation, distinguishing genes directly activated by maternal factors. NF = Nieuwkoop and Faber. (C) Heatmap of RNA-seq coverage over exons (left) and introns (right) of activated genes.
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