Source phylogenetic ML trees for phylogenetic supertree construction. (a) ORF1ab; (b) Spike protein; (c) M protein; (d) N protein; (e) E protein; (f) ORF3a; (g) ORF6; (h) ORF7a; (i) ORF8. Clades of SARS-CoV-2 are in bold in all source phylogenetic ML trees. Bat virus MG996532 is written in red, MG772933 and MG772934 are in blue. Clades of SARS-CoV and MERS-CoV are highlighted in green and purple, respectively.