The Cellular Overview Omics Viewer. The Cellular Overview with expression data overlaid on metabolic pathways (Omics Viewer). The small window with buttons labeled "Pause", "Slower", and so on, is the control panel. Shown in this example is an animation of three experiments. On the left of the control panel is the color key that describes how data values are mapped to colors. Mousing over a reaction (not shown) displays a tooltip containing data about the reaction and the experimental value for that reaction at the current step of the animation.