Fig. 2. Size of pPRLR mRNA transcripts and protein. (A) PolyA+ RNA (5g) from liver and kidney of
miniature pigs was probed with a pPRLR ECD cDNA probe. The transcript sizes are indicated in kilobases. (B)
Expression of PRLR in miniature pig mammary gland. Western blot analysis of mammary gland membranes
(MG membranes; 20g) and total cell lysate (total MG; 10g) using a monoclonal -PRLR-ECD antibody. One
specific band (80 kDa) corresponding to pPRLR was identified in the membrane preparation but was undetectable
in the total cell lysate. The other bands in the two lanes were also detected on a control western blot using the
secondary -mouse antibody alone. (C) Different sizes of human, mouse and pPRLR-Flag proteins expressed in
CHO-K1 cells. Cells were transfected with 1g PRLR DNA per well for 24 h, the media replaced with serum free
media and the cells harvested for protein 24 h later. The amount of total protein loaded on the gelwas 2.5g from the