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The amino acid requirements of the preimplantation mouse embryo in culture changes as development proceeds from the zygote to the blastocyst stage. Eagle's non-essential amino acids and glutamine significantly increased cleavage rates during the first four cell cycles, while Eagle's essential amino acids without glutamine did not confer any benefit to embryo development before the eight-cell stage. After the eight-cell stage, non-essential amino acids and glutamine no longer stimulated cleavage rates but significantly increased blastocoel development and blastocyst hatching. In contrast, after the eight-cell stage essential amino acids increased cleavage rates as well as stimulating development of the inner cell mass of the resultant blastocysts. Fetal development after transfer of blastocysts was also significantly increased by culture with essential amino acids from the eight-cell stage. Consequently highest rates of development in vitro and viability after transfer were achieved when embryos were cultured with non-essential amino acids and glutamine to the eight-cell stage followed by development to the blastocyst stage in the presence of all 20 amino acids. Analysis of the parameters measured revealed a significant relationship between number of blastocyst cells and inner cell mass development with viability after transfer. Blastocyst formation and hatching could not be used to assess subsequent developmental potential.
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