(a) Sliding window analysis of the dN/dS ratio along atp5c1 (window 50 AA wide, sliding every codon). The position of replacement mutations is provided on the right (gray dots), as well as the position of conserved interaction sites detected by CDD (Marchler-Bauer et al., 2013) (black, blue, and red: interactions with core domain, delta, and epsilon subunits, respectively). (b) Three-dimensional model of the ATP synthase gamma subunit of Limecola balthica (I-TASSER prediction based on reference contig from Gdańsk). The yellow segment represents the 46 residue-long fragment bearing replacement mutations (gray dots).