Brown ME, Singh RP, Pukazhenthi B, Keefer CL, Songsasen N. (2018) Cryopreservation effects on sperm function and fertility in two threatened crane species. Cryobiology.  Jun;82:148-154. doi: 10.1016/j.cryobiol.2018.01.010. Epub 2018 Feb 3.

Thuwanut P, Comizzoli P, Wildt DE, Keefer CL, Songsasen N. (2017) Stem cell factor promotes in vitro ovarian follicle development in the domestic cat by upregulating c-kit mRNA expression and stimulating the phosphatidylinositol 3-kinase/AKT pathway.  Reprod Fertil Dev. 29(7):1356-1368.  doi:10.1071 [2016 Jun 9]

Brown, M.E., Converse, S., Chandler, J, Crosier, A., Lynch, W., Wildt, D., Keefer, C., and Songsasen, N. 2017. Time within reproductive season, but not age or inbreeding coefficient, influences seminal and sperm quality in the whooping crane (Grus americana). Reprod. Fertil. Dev. Feb;29(2):294-306. doi: 10.1071/RD15251.

Vansandt, L.M., Livesay, J.L., Dickson, M.J., Li,L., Pukazhenthi, B.S., Keefer, C.L. 2016. Conservation of spermatogonial stem cell marker expression in undifferentiated felid spermatogonia. Theriogenology . Sep 1;86(4):1022-1035.e3. doi

 Brown, M.E, Converse, S.J, Chandler, J.N., Shaferc,C., Brown, J.L.,Keefer, C.L., Songsasen, N. (2016) Female gonadal hormones and reproductive behaviors as key determinants of successful reproductive output of breeding Whooping Cranes (Grus americana). Endocrinology. May 1;230-231:158-65. doi: 10.1016

 Keefer, C.L. 2015. Artificial cloning of domestic animals. Proc. Natl. Acad. Sci. USA. Jul 21:112(29):8874-8878.

Fujihara, M., Comizzoli, P., Keefer, C.L., Wildt, D.E., andN. Songsasen. In press. Epidermal Growth Factor (EGF) Sustains In Vitro Primordial Follicle Viability by Enhancing Stromal Cell Proliferation via MAPK and PI3K Pathways in the Prepubertal, but Not Adult Cat Ovary. Biol Reprod. 90(4):86, 1-10. 

Collins, C.W., S.L. Monfort, M.M. Vick, B.A. Wolfe, C.L. Keefer, and N. Songsasen. 2014. Oral and injectable synthetic progestagens effectively manipulate the estrous cycle in the Przewalski’s horse (Equus ferus przewalskii). Anim. Rep. Sci. 148(1-2):42-52

Schiffmacher, A. and Keefer, C.L. (2013). CDX2 regulates multiple trophoblast genes in bovine trophectoderm CT-1 cells. Molecular Reproduction and Development. 80(10):826-839.

Lei, L., Li, L., Du, F., Chen, C.H., Wang, H., and Keefer, C.L. (2013). Monitoring bovine fetal fibroblast reprogramming utilizing a bovine NANOG promoter-driven EGFP reporter system. Molecular Reproduction and Development. 80(3):193-203.

Nestle, E., Graves-Herring, J., Keefer, C.L. and Comizzoli, P. (2012). Protein source does not affect blastocyst quality Reproduction in Domestic Animals. 47 Suppl 6:152-5. doi: 0.1111/rda.12047.

Vansandt, L,, Pukazhenthi, B., andKeefer, C.L. (2012).  Spermatogonial stem cell markers in the cat. Reproduction in Domestic Animals.  47 Suppl 6:256-60. doi: 10.1111/rda.12079

Schiffmacher, A.T., Keefer, C.L. (2012). Optimization of a lipitoid-based plasmid DNA transfection protocol for bovine trophectoderm CT-1 cells. In Vitro Cellular & Developmental Biology – Animal. 48(7):403-406.

Ladjal H, Hanus JL, Pillarisetti A, Keefer C, Ferreira A, Desai JP. (2012). Reality-based real-time cell indentation stimulator. IEEE/ASME Transactions on Mechatronics17 (2), 239- 250. 

Collins, C.W., Songsasen, N. S., Vick, M. M., Wolfe, B. A., Weiss, R. B., Keefer, C. L., and Monfort, S. L.. (2012). Abnormal Reproductive Patterns in Przewalski's Mares Are Associated with a Loss in Gene Diversity. Biol Reprod 86(2):28,1–10.

Pillarisetti,A., Desai, J.P., Ladjal, H., Schiffmacher, A., Ferreira, A., Keefer, C.L. (2011). Mechanical Phenotyping of Mouse Embryonic Stem Cells: Increase in Stiffness with Differentiation. Cellular Reprogramming 13, 371-380.

Keefer, C.L. and Desai, J.P. (2011). Mechanical Phenotyping of Stem Cells. Theriogenology 75(8):1426-1430.

Pant, D., Keefer, C.L. (2009). Expression of pluripotency-related genes during bovine inner cell mass explant culture. Cloning & Stem Cells 11:355-65.

He, S., Pant, D., Schiffmacher, A., Meece, A., Keefer, C.L. (2008). Lef1 mediated Wnt signaling promotes the initiation of trophoblast lineage differentiation in mouse embryonic stem cells. Stem Cells 26:842-849.

Keefer, C.L. (2008) Lessons learned from nuclear transfer (cloning). Therio. 69:48-54.

Keefer, C.L., Pant. D., Blomberg, L., Talbot, N.C. (2007). Challenges and prospects for the establishment of embryonic stem cell lines of domesticated ungulates.  Animal Reproduction Sciences. 98 (1-2):147-168.

He, S., Pant, D., Schiffmacher, A., Bischoff, S., Melican, D., Gavin, W., Keefer, C.L. (2006). Developmental expression of pluripotency determining factors in caprine embryos:  Novel pattern of NANOG protein localization in the nucleolus.  Mol.Reprod. Dev. 73:1512-1522.

Betts, D.H., Perreault, S.D., Petrik, J., Lin, L., Favetta, L.A., Keefer, C.L., King, W.A. (2005). Telomere length analysis in goat clones and their offspring. Mol. Reprod. Dev. 72(4):461-470.

Keefer, C.L. 2004. Production of bioproducts through the use of transgenic animal models. Animal Reproduction Science 82-82:5-12. [One of the 10 most downloaded articles from the journal via ScienceDirect® platform in 2005]