Fig. 1From: Recombination analysis on the receptor switching event of MERS-CoV and its close relatives: implications for the emergence of MERS-CoVMaximum-likelihood phylogenetic tree based on the complete genome of the merbecoviruses. The red squares represent ACE2 usage, blue circles represent DPP4 usage, and green triangles represent unidentified receptor usage. Numerical node support values are shown above each internal node. The scale bar represents genetic distance. Four representative ACE2-using sarbecoviruses were used for rooting the phylogenyBack to article page