The number of synonymous allele specific changes from preferred codons (PR) to non-preferred (NPR) codons and from NPR to PR in the introgressed region of N. tetrasperma Lineage 1, Lineage 4, and Lineage 9, relative to N. crassa.

1No of excess switches = No of switches from PR to NPR – No of switches from NPR to PR. It represents the allele specific excess of non-preferred codon changes.2Frequency of excess PR to NPR switches per 1000 = (No of excess of switches/No of total codons)×1000. The total codons for Lineage 1, Lineage 4 and Lineage 9 are 283392, 282819 and 282723, respectively. The number differs due to the removal of non-synonymous change codons.