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Postnatal Long photoperiod exposures result in lasting changes in 5-hydroxyindoleacetic Acid (5-HIAA) concentration. (A) Analysis of 5-HIAA content across photoperiods at P30, (B) at P50 and (C) within photoperiods during the P30 and P50 time points. The significance levels are as follows: (*p < 0.05, **p < 0.01) using Holm-Sidak’s multiple comparison tests.
