2.1.1.101 pharmacology tylosin fermentation, antibiotic biosynthesis, enzyme catalyzes conversion of macrocin to tylosin in vivo 485050 2.1.1.101 agriculture tylosin is used in the swine industry as a growth promotant 485048 2.1.1.101 pharmacology tylosin is used in veterinary medicine for treatment of infections caused by gram-positive bacteria and mycoplasma 485048