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Fig. 5. The
15N of cells, plasma and excreta was significantly
enriched relative to diet in Yellow-vented bulbuls on all diets. In contrast,
the
15N of urine was depleted relative to diet in birds fed
the diet with the low protein content. The
15N of urine did
not differ from that of diet in birds fed the diets with the medium and high
protein content. Error bars represent 95% confidence intervals for means.