Best way to express Lucif activity?

[Joe Miano]

I am sure this has been debated, but can someone comment on the best method
of expressing luciferase (or for the matter CAT) data?  I have been
normalizing the raw RLUs to total protein and then express this value as
either a percent of the SV40 control or as a fold increase over the basic
(promoterless and enhancerless) vector.
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