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Garbayo, J.M., B. Serrano and F. Lopez-Gatius, 2008. Identification of novel pregnancy-associated glycoproteins (PAG) expressed by the peri-implantation conceptus of domestic ruminants. Anim. Reprod. Sci., 103: 120-134.
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Garbayo, J.M., J.A. Green, M. Manikkam, J.F. Beckers, D.O. Kiesling, A.D. Ealy and R.M. Roberts, 2000. Caprine pregnancy-associated glycoproteins (PAG): Their cloning, expression and evolutionary relationship to other PAG. Mol. Reprod. Dev., 57: 311-322.
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Green, J.A., S. Xie and R.M. Roberts, 1998. Pepsin related molecules secreted by trophoblast. Rev. Reprod., 3: 62-69.
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Guruprasad, K., T.L. Blundell, S. Xie, J. Green and B. Szafranska et al., 1996. Comparative modeling and analysis of amino acid substitutions suggests that the family of pregnancy-associated glycoproteins includes both active an inactive aspartic proteinases. Protein Eng., 9: 849-856.
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Hughes, A.L., J.A. Green, J.M. Garbayo and R.M. Roberts, 2000. Adaptive diversification within a large family of recently duplicated, placentally expressed genes. Proc. Natl. Acad. Sci. USA., 97: 3319-3323.
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Sasser, R.G., C.A. Ruder, K.A. Ivani, J.E. Butler and W.C. Hamilton, 1986. Detection of pregnancy by radioimmunoassay of a novel pregnancy-specific protein in serum of cows and a profile of serum concentrations during gestation. Biol. Reprod., 35: 936-942.
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Sousa, N.M., A. Ayad, Z. Beckers and Z. Gajewski, 2006. Pregnancy-associated glycoprotein as pregnancy markers in the ruminants. J. Physiol. Pharmacol., 57: 153-171.
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Szafranska, B., S. Xie, J. Green and R.M. Roberts, 1995. Porcine Pregnancy-associated glycoproteins: New members of the aspartic proteinase gene family expressed in the trophectoderm. Biol. Reprod., 53: 21-28.
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Telugu, B.P., A.M. Walker and J.A. Green, 2009. Characterization of the bovine pregnancy-associated glycoprotein gene family-analysis of gene sequences, regulatory regions within the promoter and expression of selected genes. BMC Genomics., 10: 185-185.
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Xie, S., B.G. Low, R.J. Nagel, J.F. Beckers and R.M. Roberts, 1994. A novel glycoprotein of the aspartic proteinase gene family expressed in bovine placental trophectoderm. Biol. Reprod., 51: 1145-1153.
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Xie, S., B.G. Low, R.J. Nagel, K.K. Kramer and R.V. Anthony et al., 1991. Identification of the major pregnancy specific antigens of cattle and sheep as inactive members of the Aspartic Proteinase family. Proc. Natl. Acad. Sci. USA., 88: 10247-10251.
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Xie, S., J. Green, B. Bao, J.F. Beckers, K.E. Valdez, L. Hakami and R.M. Roberts, 1997. Multiple pregnancy-associated glycoproteins are secreted by day 100 ovine placental tissue. Biol Reprod., 57: 1384-1393.
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Zoli, A.P., J.F. Beckers, P. Wouters-Ballman, J. Closset, P. Falmagne and F. Ectors, 1991. Purification and characterization of a bovine pregnancy-associated glycoprotein. Biol. Reprod., 45: 1-10.
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