CTAB method of DNA purification

[Eva Pietrzak]

Hello, netters

I have a questions regarding the CTAB method of purifying bacterial DNA I can not
answer with the few books close to my hand :

In Current protocols in Molecular Biology (Eds. Ausubel et al) DNA is extracted first
with chloroform/isoamyl, then with phenol/chloroform/isoamyl.
Is there a reason for this reversal of the normal order of extraction, or is it a mistake
in the protocol?

Thanks, Eva