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 The 4-amino or 4-keto group of pyrimidine bases is located in the

  1. major groove of the double stranded DNA
  2. minor groove of the double stranded DNA
  3. minor groove of the B form DNA but not the A form DNA
  4. major groove of the B form DNA but not the A form DNA
in Recombinant DNA technology and Other Tools in Biotechnology edited by
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