In an Escherichia coli strain of human origin, ampicillin resistance and heat-stable enterotoxin activity were shown by EcoRI restriction endonuclease and genetic analysis to be in an 80-megadalton plasmid.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC551356PMC
http://dx.doi.org/10.1128/iai.30.2.617-620.1980DOI Listing

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