FIG. 4. .

Temporal expression and regulation of Rhox mRNA during postnatal epididymal development. WT and Rhox5-null (KO) epididymal samples (n = 6) were prepared from animals of the indicated postnatal age and the relative expression of each Rhox gene was determined by qPCR as described in Figure 1. Data are presented as fold relative to their specific background value established by the signal observed in WT epididymis on P7. P7 expression levels were similar to no-RT control reactions (data not shown) and arbitrarily given a value of 1. Asterisks indicate segments exhibiting significantly different relative expression between WT and Rhox5-null animals (*P < 0.05, **P < 0.01, ***P < 0.001).