Identification of native DiTG in the developmental stages of D. immitis. Immunoblot analysis was carried out with IgG-enriched anti-rDiTG antiserum and the following parasite extracts. Lanes: 1, 0-hr L3 (200); 2, 48-hr L3 (200); 3, 6-day L4 (200); 4, larval E-S products (10 μg); 5, adult female worm (10 μg); 6, adult male worm (10 μg); 7, adult E-S products (10 μg); 8, rDiTG (100 ng, ).