Biosafety classification is based on U.S. Public Health Service Guidelines, it is the responsibility of the customer to ensure that their facilities comply with biosafety regulations for their own country.

Olsson L, Kaplan HS. Human-human hybridomas producing monoclonal antibodies of predefined antigenic specificity. Proc. Natl. Acad. Sci. USA 77: 5429-5431, 1980. PubMed: 6159646 by selecting for resistance to 8-azaguanine; the cells cells are HAT sensitive.Olsson L, Kaplan HS. Human-human hybridomas producing monoclonal antibodies of predefined antigenic specificity. Proc. Natl. Acad. Sci. USA 77: 5429-5431, 1980. PubMed: 6159646
