Returns the subset of the MSA which appears in the features object.
extract.feature.msa(x, features, do4d = FALSE, pointer.only = FALSE)An object of type MSA
An object of type features denoting the regions
of the alignment to extract.
If TRUE, then some elements of features must have type "CDS", and only
fourfold-degenerate sites will be extracted.
If TRUE, return only a pointer to an object
stored in C (useful for large alignments; advanced use only)
An msa object containing only the regions of x appearing in the features object.
sub.msa, [.msa