Expression profiles of 3PP genes. Quantitative RT-PCR analysis of total cellular RNA from indicated tissues of E11.5, E14.5, and 8-week-old (8W) C57BL/6 mice. mRNA levels of indicated genes were normalized to GAPDH mRNA levels, and are indicated as the ratio to the amount expressed in E11.5 2PAs (■). Shown are geometric means (bars) and standard errors (lines) of 3 independent measurements.