Fig. 2From: Insecticide resistance mechanisms with novel ‘kdr’ type gene mutations in the tropical bed bug Cimex hemipterusActivity profile of carboxylesterases of Cimex hemipterus population with ρ-nitrophenyl acetate as the substrate (n = 200). Data from the 2002 population [13] are also presented for comparison. The arrow on the X-axis represents the discriminating activity level (see the text for details)Back to article page