What is meant by r in ecori?

EcoR1 = R represents the strain of the bacteria it is being acquired from

In EcoRI, R is the strain of the bacteria Escherichia Coli, I indicates it was procured before EcoRII. R strain means Rough ( Non - Virulent ). R strain of bacteria do not have a protective capsule which S strain have. You can read more about R and S strains in the biology NCERT textbook for XII standard.

ECoR1*R*- THE R IN ECoRI is the name of the strain of E.coli bacteria.. The name of strain is RY13..During nomenclature of Endonuclease👇.E-Escherichia (genus name)Co-Coli (species)R-RY 13 (strain)I- 1st isolated...