Fig. 5
Violin plot of the ratio of non-synonymous to synonymous (dN/dS) scores for proteins identified and unidentified in searches two and three in error-tolerant mode. Protein identifications are compared to the search against the human reference proteome (search one). dN/dS values between the identified proteins and the unidentified proteins is moderately different (t.test(− 2.65), df = 56.131, p = 0.01)