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Sinapis alba myrosinase activity was resistant to digestion by S. littoralis larvae and detected in larval frass. Enzymatic activity levels were determined in non-ingested material and after digestion of diet cubes spiked with pure enzyme (A) or of S. alba leaf material (B). Activities were measured using the myrosinase-specific substrate sinigrin. Shown are the means ± standard errors [N = 6 in both analyses; P = 0.2 (A) and P < 0.0001 (B)].
