Figure 2.

Distribution of selective pressures by classification. Boxplots comparing the distributions of ω values according to different gene-classification schemes. A: The photoreceptor cell-type specificity of the encoded proteins. B: The specific process in which the encoded protein is primarily active. C: The specific function of the protein (note that here “enzyme” refers to the enzymes of the retinoid cycle).

Invergo et al. BMC Evolutionary Biology 2013 13:52   doi:10.1186/1471-2148-13-52
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