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of the genus and the first two letters of the species where this restriction endonuclease may be found, for example, Escherichia coli, Eco, and Haemophilus influenzae, Hin. This is followed by the optional, non-italicized symbol "y", which indicates the type or strain identification, for example, EcoR for E. coli strains bearing the drug resistance transfer factor RTF-1, EcoB for E. coli strain B, and Hind for H. influenzae strain d. Finally, when a particular type or strain has several different restriction endonucleases, these are identified

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