Figure 3From: Expression of SHH signaling molecules in the developing human primary dentitionChanges in SHH, PTC1 , and SMO expression level in developing human primary dentition at the cap and bell stages. Real-time RT-PCR results show changes in expression levels of SHH, PTC1, and SMO at the cap and bell stages of the developing human primary dentition. The expression levels of each gene at the cap stage were set at one. *: P value ≤0.05; **: P value ≤0.01Back to article page