Count the number of mutations of each gBGC type on each branch
classify.muts.bgc(align, mod, branch = NULL)
An alignment of type msa
An evolutionary model of type tm
A character vector giving the name(s) of the branch or branches we are interested in.
A data frame with a row for each branch, giving the number of expected weak (A or T) to strong (C or G) mutations, strong to weak, weak to weak, and strong to strong. I