Figure 2. RT-PCR amplification products with amelogenin (panels A, B), DSPP (panel C), and GAPDH (panel D) specific primer sets. The amplified products were separated on a 4.5% polyacrylamide gel and stained with ethidium bromide. Lane M: molecular-size standard, 
x 174 HaeIII-digested (New England Bio-Lab). Lane 1, oral epithelium; lane 2, muscle; lane 3, connective tissue; lane 4, dental pulp cells; lane 5, secretory ameloblasts from the incisor; lane 6, secretary ameloblasts from the molar; lane 7, maturation ameloblasts from the incisor; lane 8, odontoblasts from the incisor; and lane 9, odontoblasts from the molar.
