Consider a hypothetical enzyme-coding gene and sequences of the gene from several species of rodents.The figure shows the rates of nonsynonymous and synonymous substitutions for each of four regions of the gene. 
Which region appears to be under positive selection?
Definitions:
Igneous Feature
A geological formation or structure that has been created through the cooling and solidification of magma or lava.
Laccolith
A geological formation resulting from magma pushing up between layers of rock, creating a lens-shaped mass.
Columnar Joints
Natural formations of rock into long, regular columns, typically found in basalt flows, resulting from the cooling and contraction of lava.
Igneous Rock
Rock formed through the cooling and solidification of magma or lava, categorized into intrusive or extrusive depending on the environment of formation.
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