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Change on progressive ratio breakpoint task performance induced by ingestion of a control balanced (BAL) or acute phenylalanine/tyrosine depletion (APTD) amino acid mixtures. Plotted scores are mean number of presses corresponding to the final breakpoint and standard error of the mean (SEM). Participants, regardless of light condition, worked for fewer $5 units on the APTD test day than on the BAL test day.
