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E coli K 12 - (Jun/16/2011 )

is E coli K 12 strain Category I or II ?
and how is e coli k 12 strain and e coli top 10 related ? is k12 one of top 10 strains ?

where can i look at the good safety procedure to follow for working with pseudomonas strains ?

thank you


Nearly all lab strains are E. coli K-12 derivatives, with the exception of strains such as BL21. In particular, Top10 is a K-12 derivative. All these K-12 strains are extremely safe and non-pathogenic. P. aeruginosa is (in the US) a BL-2 organism, with potential infectious behavior. Pseudomonas fluorescens is non-pathogenic, and might be easier to work with.