From this tab you can browse from a list of 5 (November 2011 release) reference dataset experiments. Each reference dataset outlines the stain, the target of the stain as well as the staining pattern.
Viewing the Experiments
Selecting the experiment ID will launch a contact sheet viewer. Clicking on individual images in the contact sheet viewer will launch a High Resolution Image Viewer. From the Image Viewer you can adjust the color channels or contrast of the image by moving the slider bars.