Figure 4.

A graphical representation of mutations of SARS-CoV-2 detected in South Korea during January to December 2020. Major nucleotide variations from the reference sequence Wuhan-Hu-1 (MN908947.3) are shown as vertical black lines and annotated by red (nonsynonymous mutations) or blue (synonymous mutations) letters. Four Korean subgroups (KR.1–4) are indicated by horizontal color stripes. An approximately maximum-likelihood phylogenetic tree of South Korean viruses is shown on the left. Syn, synonymous mutation.