#' @section Default Marker IDs:
#'
#' Default marker IDs are assigned to loci of a physical map if no other marker
#' ID is available. These are of the form \code{'c04:0108900'}, where
#' \code{'04'} is a zero-padded two-digit chromosome number and \code{'0108900'}
#' is a zero-padded seven-digit number giving the physical map position of the
#' given locus (i.e. the nucleotide position of the locus in the reference
#' sequence).
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