<i id='BD6791691F'><strike id='BD6791691F'><tt id='BD6791691F'><small lang="0db079"></small><sup draggable="599636"></sup><time dropzone="4c45d3"></time><pre date-time="1472bc" id='BD6791691F'></pre></tt></strike></i> 
A standard human genome has nearly three billion DNA letters in it. Photo: supplied
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