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Concentrations of GABA, DHHA (4,5-dihydroxyhexanoic acid), SSA (succinate semialdehyde) and GB (guanidinobutyrate) in embryo extracts as a function of developmental age. Statistical analysis performed using a two-tailed t test. Abbreviations: gr, gram; E, embryonic (for example, 10–13 is equivalent to E10–E13); P, postnatal. Note that E 10–13 embryo extracts were not available for measurement of DHHA.
