. Graphs show *n*-fold changes in mRNA expression level of histone genes based on the threshold cycle number (*C*~t~) of injected embryos compared to that of the uncompeted control embryos. *C*~t~ numbers were normalized for the endogenous MBF-0 in the same sample. Data were derived from two independent microinjection experiments and each bar represents the average of triplicate samples from the two batches of embryos.  