#NEXUS
BEGIN TAXA;
dimensions ntax=4;
taxlabels A B C D;
END;
BEGIN CHARACTERS;
dimensions nchar=6;
format
datatype=protein missing=? gap=- ;
matrix
[change: in taxon 'A', second char is changes from 'M' to 'Q']
A -QQG-?
B ---G--
C -MGG--
D -MGTGQ
;
END;
BEGIN TREES;
[change: ... ]
tree 'basic bush' = ((A:1,B:1):1,(C:1,D:1):1);
END;