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#' Add different types of tracks
#'
#' @name add_tracks
#' @param x object to add the tracks to (e.g. gggenomes, gggenomes_layout)
#' @param ... named data.frames, i.e. genes=gene_df, snps=snp_df
#' @param .track_id track_id of the feats that subfeats, sublinks or clusters map to.
#' @param .transform one of "aa2nuc", "none", "nuc2aa"
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