For a particular microarray assay (DNA chip), cDNA has been made from the mRNAs of a dozen patients' breast tumor biopsies. The researchers will be looking for

A) a particular gene that is amplified in all or most of the patient samples.
B) a pattern of fluorescence that indicates which cells are overproliferating.
C) a pattern shared among some or all of the samples that indicates gene expression differing from control samples.
D) a group of cDNAs that act differently from those on the rest of the grid.
E) a group of cDNAs that match those in non-breast cancer control samples from the same population.