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The evolutionary rates (σ2) for the output link and kinematic transmission (KT) are higher than the rates for the input and coupler links. Each rate is given with its 95% CI. Inset shows the configuration of the input (orange), output (red), and coupler (blue) links in the four-bar linkage system, and KT is denoted in the main panel in a black square. (Online version in colour.)
