You wish to set up a DNA microarray to study which genes are implicated in breast cancer. You fluorescently label normal breast tissue with a green fluorophore and tumor breast tissue with a red fluorophore. You see that your gene labeled SASH1 fluoresced green while your gene labeled HER2 fluoresced red. Taken together, these results indicate that:

a. SASH1 is overexpressed in breast cancer patients, whereas HER2 is underexpressed is breast cancer patients.
b. SASH1 is underexpressed in breast cancer patients, whereas HER2 is overexpressed is breast cancer patients.
c. both SASH1 and HER2 are underexpressed in tumor cells and normal cells.
d. both SASH1 and HER2 are overexpressed in tumor cells and normal cells.