“…Among these proteins, OBPs are the most abundant and expected to be involved in the first biochemical step in odorant reception. Insect OBP family can be divided into three major classes, pheromone binding proteins (PBPs) (Vogt and Riddiford, 1981), general odorant binding proteins (GOBP1 and GOBP2) (Vogt et al, 1991), and antennal binding proteins X (ABPX) (Krieger et al, 1996). So far, OBPs have been identified in many insect orders such as in Lepidoptera (Vogt and Riddiford, 1981), Orthoptera (Ban et al, 2003), Isoptera (Krieger and Ross, 2002), Diptera (Xu et al, 2003), Hymenoptera , Hemiptera (Dickens et al, 1995) and Coleoptera (Graham et al, 2003).…”