Restriction enzyme help

Shawn Abigail abigail at
Fri Apr 2 13:16:17 EST 1993

I downloaded a file with a list of restriction enzymes, their sequences
and sources.  I am a little confused over the nomenclature of the sequences.
C, T, A & G are obvious!  R stands for a Purine and Y stands for a
Pyrimidine.  Does N stand for "any nucleotide"?  What about W and S?
Any help is gratefully appreciated.

Shawn Abigail
abigail at

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