Obtain the range of coordinates in a MSA objects
coord.range.msa(x, refseq = names.msa(x)[1])
An object of type msa
A character string identifying the reference sequence (or NULL to use frame of reference of entire alignment)
A numeric vector of length 2 giving the smallest and highest coordinate in the alignment. If refseq is the first sequence in alignment, offset.msa(x) is added to the range, otherwise it is ignored.