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A previous report (Moore and Bondioli Biol. Reprod. 48:833 1993.) has shown that the addition of high concentrations of the amino acids glycine and alanine to a modified Brinster's mouse ovum culture medium resulted in enhanced development of bovine embryos co-cultured with oviductal cells. This experiment tested whether this effect would be seen with CR1aa (Rosenkrans et al. Biol. Reprod. 49:459...