Fig. 2From: Mutations in SARS-CoV-2 structural proteins: a global analysisPie chart plot of the number of mutations among E and M proteins of SARS-CoV-2 up to January 2022. The incidence rate of one, two, three, four, and more mutations, in addition to the rate of lack of any mutation among these proteins, has been displayed in the clusters A and BBack to article page