Removed all the ranges that are not protein coding. Typically used on
the output of etrid2grl before
mapToGenome.
signature(object="GRanges", mcol="character",
coding="character")mcols()$mcol is different from coding. The default
values are mcols()feature and
"protein_coding". The method return the GRanges
trimmed from all non-matching ranges.
signature(object="GRangesList", mcol="character",
coding="character")GRanges in a
GrangesList.