Introduction to Histograms

Hey Flowers,

I have a few questions concerning histograms.  I am comparing melanoma
cells treated with recombinant proteins and untreated melanoma cells.
What is the most efficient way to analyze data on a histogram?	Do I
just compare percentages (i.e.percent gated, percent positive for a
particular surface marker)?  What all should I be looking for when
comparing histograms (excluding my specific interests of study)?  Thanks
in advance!

Israel