 His studies related to differential transcriptional regulation of interferon-t by ETS-2 and Oct-4 transcription factors, led to the identification of a putative developmental switch that may lead to the formation of trophectoderm in early embryo development.He has also identified at least 100 expressed genes for pregnancy-associated proteins in the aspartyl proteinase gene family, which has formed the basis of an accurate and sensitive pregnancy test for dairy cattle sold by IDEXX Corporation.His research on sexual dimorphism in embryos has led to the discovery that the mother’s diet, such as fat, close to the time of conception, may play a role in selecting the offspring’s sex.