Expression of 3PP genes in fetal thymus cells. Quantitative PCR analysis of total cellular RNA from indicated cell fractions purified from E14.5 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 CD45⁺ leukocytes (left panels), CD45⁻IA⁺ epithelial cells (middle panels), or CD45⁻IA⁻PDGFRα⁻ nonepithelial, nonmesenchymal stromal cells (right panels). Means and standard errors of the results obtained from 3 independent measurements are shown.