Figure 2.

The synteny blocks between four pinniped species: PSIB was chosen as a reference and HGRY, PLAR, and PVIT were designated as the query species. Each chromosome was split into bottom and top parts: synteny blocks were drawn on the top part if it had the same orientation in both the reference (PSIB) and query species, and in the bottom part if the orientation was different. Chr 6 was enlarged, to emphasize the presence of three megabase-scale inversions. The yellow color on the enlarged pane highlights the single inversion common for PVIT and PLAR, and the orange color indicates the two inversions unique to PVIT. HGRY chr6 was reverse complemented in the small pane, and labeled with an asterisk on the small pane to avoid ambiguity.