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. 2016 Apr 21;4:e1939. doi: 10.7717/peerj.1939

Figure 1. Average plasma melatonin concentrations under different conditions.

Figure 1

Plasma melatonin concentrations of 19 adult zebra finches measured during day (LD day), night (LD night), nighttime in constant light (LL night), with high concentration melatonin cream (LL night mel high) and with low concentration melatonin cream (LL night mel low); LD indicates a normal light cycle; LL indicates constant light. Groups with different letters (A/B/C) are significantly different (Tukey’s post-hoc test, p < 0.01).