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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.
Wickner RB. Chromosomal and non-chromosomal mutations affecting the "killer character" of Saccharomyces cerevisiae. Genetics 76: 423-432, 1974. PubMed: 4364866
Poor mater.