<i id='81A912EB58'><strike id='81A912EB58'><tt id='81A912EB58'><small dir="134b0c"></small><sup lang="09b2f0"></sup><time draggable="bdec26"></time><pre date-time="c730d4" id='81A912EB58'></pre></tt></strike></i> 
A standard human genome has nearly three billion DNA letters in it. Photo: supplied
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