DNase-treated total RNA (5 μg) from transfected CHO-K1 cells or polyA+ RNA (5 μg) from the liver and kidney of one miniature pig was electrophoresed and transferred to Hybond-XL (Amersham Biosciences UK Ltd., Buckinghamshire, England). Blots were hybridized overnight at 65 °C [28] with a 716 bp pPRLR ECD fragment labeled with [α-32P]dCTP using the Prime-It II Random Primer Labeling Kit (Stratagene). Blots were then washed at 65 °C to a stringency of 0.1 × SSC/0.1% SDS and subjected to phosphorimaging using a Storm 860 (Molecular Dynamics, Sunnyvale, CA).