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Phospholipase A2 (PLA2) activity of the two Vipera berus venoms. Venoms from melanistic and cryptic specimens are represented in orange and blue, respectively. The graph represents the normalized (positive control: bee venom PLA2, 100%; negative control: buffer, 0%) results of the five concentrations tested (i.e. 3.125, 6.25, 12.5, 25 and 50 µg ml−1). Data are means ± s.d. of technical replicates (n = 3).
