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Vasoactive intestinal polypeptide-like immunoreactive neuron numbers and neuronal soma areas (means + standard deviations) in the infundibulum of photorefractory (PR), short-term photosensitive (ST-PS), and long-term photosensitive (LT-PS) adult male dark-eyed juncos (n = 5/group). For a given parameter, columns with a different superscript letter differ statistically (P < 0.05, Fisher least significant difference test).
