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This massive circular structure is made entirely of mammoth bones and skulls. DNA now offers clues about how Ice Age hunters built itSomewhere in the frozen plains of southwestern Russia, a 40-foot circle of mammoth bones and tusks has stood for over 24,000 ...
Small cellular organelles called mitochondria contain their own circular DNA ... Many interesting features distinguish human mitochondrial DNA from its nuclear counterpart, including the following ...
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