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<a href="http://www.clker.com/cliparts/u/S/7/W/0/A/closed-centrifuge-tube-th.png"><img src='http://www.clker.com/cliparts/u/S/7/W/0/A/closed-centrifuge-tube-th.png' alt='Closed Centrifuge Tube clip art'/></a>
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<a href="http://www.clker.com/cliparts/u/S/7/W/0/A/closed-centrifuge-tube-md.png"><img src='http://www.clker.com/cliparts/u/S/7/W/0/A/closed-centrifuge-tube-md.png' alt='Closed Centrifuge Tube clip art'/></a>
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<a href="http://www.clker.com/cliparts/u/S/7/W/0/A/closed-centrifuge-tube-hi.png"><img src='http://www.clker.com/cliparts/u/S/7/W/0/A/closed-centrifuge-tube-hi.png' alt='Closed Centrifuge Tube clip art'/></a>
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