An efficient method for isolation of auxotrophs of Penicillium chyrysogenum involving mutagenesis with ethyl methanesulfonate followed by enrichment with sodium pentachlorophenate was developed. The auxotroph frequencies obtained were 30 to 40%.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC380710PMC
http://dx.doi.org/10.1128/am.24.6.995-996.1972DOI Listing

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