Orthology matrix as calculated from the all vs. all orthology search across Set-R (OMA orthologous groups).

(1) The column header contains the labels of the NCBI RefSeq assembly accession of each genome. Row indices refer to the orthologous group identifier. The matrix fields contain the NCBI RefSeq protein sequence accession if an ortholog was identified and left empty otherwise. (2) List of orthologous groups identifiers constituting the core genome by our definition. These were used for tree reconstruction. (XLSX)