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— Amino acid depletion/appearance ± SEM by individual human embryos over the compacting 8-cell to morula transition which subsequently formed blastocysts (n = 23), or which arrested in culture prior to cavitation (n = 32). *P < 0.05; **P < 0.01; ***P < 0.001 significance from zero (from Houghton et al., 2002).
