Expression of VPREB1, VPREB3, and IGLL1 in bovine fetuses. Gene expression was analyzed by RT-PCR as described in methods. The individual animals and their estimated fetal ages are indicated on top. The amplicon lengths were: 558 bp (VPREB1), 491 bp (VPREB3), 475 bp (IGLL1) and 150 bp (GAPDH). V1 = VPREB1, V3 = VPREB3, L5 = IGLL1, G = GAPDH, bm = bone marrow, nd = not determined.