FAQ: Can T4 DNA Polymerase be used to blunt DNA?

Yes, 5' overhangs (3' recessed ends) can be filled in and 3' overhangs will be removed.
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    DNA Blunting Tutorial

    The first step in determining how your ends will be blunted is to determine if they are 5´ or 3´ overhangs. This tutorial will teach you how to identify what type of overhang you have, as well as which enzyme will blunt that end, and how.