EcoRI is a restriction endonuclease. How is it named?

Explanation

The first letter .E. comes from the genus-Escherichia. The second and third letters .co. come from the name of the species .coli. from where it is isolated. The forth letter .R. comes from the type/strain of the bacterium. The Roman Number .I. indicates the order in which the enzyme is isolated from that strain of bacteria-Escherichia coli RY13