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H.O. Smith, K.W. Wilcox, and T.J. Kelley, working at Johns Hopkins University in 1968, isolated and characterized the first restriction nuclease whose functioning depended on a specific DNA nucleotide sequence. Working with Haemophilus influenzae bacteria, this group isolated an enzyme, called HindII, that always cut DNA molecules at a particular point within a specific sequence of six base pairs. This sequence is:
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They found that the HindII enzyme always cuts directly in the center of this sequence. Wherever this particular sequence of six base pairs occurs unmodified in a DNA molecule, HindII will cleave both DNA backbones between the 3rd and 4th base pairs of the sequence. Moreover, HindII will only cleave a DNA molecule at this particular site. For this reason, this specific base sequence is known as the "recognition sequence" for HindII.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "HindII". A list of authors is available in Wikipedia.|