Distribution of mutations detected in all ML29 isolates compared with parental viruses MOPV and LASV (the genome GenBank identification number and size are shown below). The small boxes between the arrows represent the ML29 noncoding sequence, and the orange arrows correspond to open reading frames. The numbers represent the position of each change. The first letter is the previous amino acid, and the last letter is the new amino acid. NCR, noncoding region; Ins, insertion; Del, deletion.