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. 2021 Jan 29;118(5):e2022496118. doi: 10.1073/pnas.2022496118

Fig. 1.

Fig. 1.

A cartoon illustrating the fitness landscape of a virus with only one protein with two residues. The horizontal plane represents the amino acid sequence space of the virus, and the relative fitness of strains is depicted as the height of the third dimension. The dotted line represents a potential compensatory pathway.