Tissue distribution of guinea pig Prlrp1 and Prlrp2 mRNAs. A, Northern blot analysis for Prlrp1 and Prlrp2 mRNAs in the placenta, subplacenta, anterior pituitary, ovary, mammary gland, heart, kidney, liver, muscle, and brain from gestation d 35 pregnant guinea pigs. B, RT-PCR analysis of Prlrp1 and Prlrp2 mRNAs in the same tissues shown in A. C, RT-PCR analysis for Prlrp1 and Prlrp2 mRNAs from guinea pig placental and subplacental tissues representing d 15–55 of gestation. Expression of 18S RNA was used as an internal control for RNA integrity. Note that guinea pig Prlrp1 and Prlrp2 mRNAs are expressed in placenta.