TABLE 1.

Characteristics of E. coli ssDNA exonucleases

Genea	Protein	Polarity	Target	Location (min)
xonA, sbcA	ExoI	3′→5′	ssDNA	44.85
recJ	RecJ	5′→3′	ssDNA	65.41
xseA	ExoVII	3′⇆5′	ssDNA	56.74
exoX, yobC	ExoX	3′→5′	ssDNA/dsDNA	41.48

^aOther commonly used gene names are indicated as appropriate.