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How are restriction endonuclease named ?...

How are restriction endonuclease named ?

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The naming of restriction endonuclease is based on the following rules :
(1) The first letter of the REN refers to the genus name of the bacteria from whoch it is derived and written in capitals .
(2) The second and the third letters refer to the species name of the bacteria from which it is derived and is written as a small letter .
(3) If a fourth letter is present it represents the name of the bacterial strain or subspecies .
(4) The Roman number indicates the different REN's derived from the same organism . Eg.: Hind III.
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