Fig. 3
From: GC-biased gene conversion conceals the prediction of the nearly neutral theory in avian genomes
Relationships between dN/dS and body mass separately for GC-poor genes (low GC content) and GC-rich genes (high GC content). Low GC content (L; filled shapes) and high GC content (H; hollow shapes). a All substitution categories together (total; black circles), b GC-conservative substitutions (gray diamonds), c S-to-W substitutions (blue triangles), and d W-to-S substitutions (red squares). Each dot corresponds to a terminal branch of the avian phylogeny. Regression lines for each substitution category are shown using the same color scheme. Solid lines correspond to GC-poor genes, dashed lines to GC-rich genes