#' hierarchical transversion
#' An experiment:
#' - precusor proteins
#' - metadata
#' - PTMs
#' - peptides
#' - sequences
#' - metadata
#' - PTMs
#' - intensities
#' - positions
#' - metadata
#' Need to create data frames for ggplot2
#' how to transverse by protein / peptide?
#'
#' - peptide
#' - metadata:
#' - protein
#' - experiment
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