Antibiotic refers to a class of secondary metabolites produced by microorganisms or higher animals and plants in the process of life with anti-pathogen or other activities, and can interfere with the development of other living cell function of chemical substances. Yeasen provides several antibiotics which can be used in screening of stably transfected cell lines or sterilization in cell culture, such as hygromycin B, tetracyclin HCl, and ampicillin sodium salt etc.