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Effects of L-Leu in ovo injection on tyrosine (A), lysine (B), and proline (C) concentration changes in the plasma of chick embryos. The number of chick embryos in each group was n=6. Values are represented as mean±SEM. Different letters beside the symbols indicate significant (P<0.05) differences. L-Leu, L-leucine; ED, embryonic day.
