Figure 2From: Age-dependent induction of immunity and subsequent survival costs in males and females of a temperate damselflyMean melanisation index (± 1 SE) for males (circle) and females (square) of (a) newly emerged and (b) mature Enallagma boreale 12 h after injection of saline or LPS and held at 22°C. Melanisation index values provide an indication of Phenoloxidase (PO) activity i.e. higher values indicates higher PO activity. Numbers indicate sample size.Back to article page