Endometrial expression of CD45, TLR4, CD14 , and MD-2. Expression of mRNA encoding CD45, TLR4, CD14, and MD-2 in endometrial biopsies collected from infertile (closed bar) and fertile animals (open bar), during Periods 1 and 2. RNA was isolated from biopsies, reverse transcribed and analysed by quantitative PCR for the mRNA encoding pan-leukocyte marker, CD45 and components of the LPS receptor complex, TLR4, CD14 and MD-2. *P < 0.05 compared with infertile animals, within the period. Numerical values are presented as the mean + SEM.