Fig. 1

Principal component analysis of microarray transcriptome results of epithelial cells from the ampulla and isthmus taken from heifers killed in the follicular phase (FP) and luteal phase (LP) of the estrous cycle. Red: FP ampulla, Blue: FP isthmus, Green: LP ampulla, Purple: LP isthmus. Each Bovine 1.0 ST array includes 26,775 probesets