An antibacterial and antimycobacterial reagent. Broad spectrum cell culture antibiotic that is nontoxic to viruses and mammalian cells at antibacterial levels Active against gram positive and gram-negative bacteria and mycoplasma; useful for long-term virus and tissue culture studies Interferes with bacterial protein synthesis by binding to L6 protein of 50S ribosomal subunit. Common working concentration is 5 g/mL Used as an antibacterial or antimycobacterial.