Fig. 4From: Designed biosynthesis of 25-methyl and 25-ethyl ivermectin with enhanced insecticidal activity by domain swap of avermectin polyketide synthaseHPLC analysis of the mycelial extracts from the parental and mutant strains. a S. avermitilis NA-108; b S. avermitlis AVE-T27; c standard sample ivermectin B1a; d S. avermitilis AVE-H39. B1a avermectin B1a, B2a avermectin B2a, B1b avermectin B1b, B2b avermectin B2b, Ive B1a ivermectin B1a, 1 compound 1, 2 compound 2 Back to article page