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Figure 1

From: Canalised and plastic components of melanin-based colouration: a diet-manipulation experiment in house sparrows

Figure 1

Food consumption and body mass of house sparrow. Food consumption (g) per individual in control and PT-reduced diet (phenylalanine and tyrosine at 42% of their level in the control diet; A), body mass of house sparrows before and after the experiment (B). Control males were injected with saline vehicle, whereas immune challenged (LPS) birds were injected with lipopolysaccharide.

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