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Bur oak branch

June 30, 2009 | 12:01 a.m. CDT
When John Sam Williamson Jr.'s big bur oak was grafted, a portion of the tree, similar in size to the branch above, was removed and placed on a stump so that a new tree with the exact genetic makeup of the big bur oak would grow. One such "cloned" tree lies in Williamson's backyard, though it is about 330 years younger than its predecessor.

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