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Eco RI is the name of a restriction end...

Eco RI is the name of a restriction endonuclease. What does 'E' , 'co', 'R' and 'I' mean ?

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.E. stands for Escherichia (genus)
.co. - Coli RY 13 (species)
.R. is derived from the name of strain.
.I. indicates the order in which the enzymes were isolated from that strain of bacteria .
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