[molecular_function] 5'-3' DNA exonuclease activity <sep> 5'-3' exonuclease activity <sep> 5'-flap endonuclease activity <sep> DNA binding <sep> DNA exonuclease activity <sep> double-stranded DNA 5'-3' DNA exonuclease activity <sep> double-stranded DNA endonuclease activity <sep> metal ion binding