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Sizes of OR subfamilies in human vs. mouse. Each human (red) and mouse (green) subfamily is indicated by a horizontal bar. The number of ORs per subfamily is shown on the x axis. The 150 subfamilies shared by the two species are indicated by pairs of red and green bars. Most of the shared subfamilies have more members in mouse than in human. Subfamilies unique to mouse or human, or found in both species, are indicated on the left.
