#' Dataframe of biomarkers in each paper.
#'
#' A dataset containing the information about papers mentioning pain biomarkers
#'
#' @format A data frame with 2592 rows and 6 variables:
#' \describe{
#' \item{STUDY (PMID)}{The pubmed ID code. Can be accessed with \url{https://www.ncbi.nlm.nih.gov/pubmed/PMID}}
#' \item{BIOMARKER}{biomarker}
#' \item{TISSUE}{the tissue the biomarker was found in the paper}
#' \item{mRNA}{Biomarker measured as level of mRNA in the tissue.}
#' \item{PROTEIN}{Biomarker measured as level of protein in the tissue.}
#' \item{RESPONSE}{Biomarker level was either increased, decreased, or not changed in the tissue.}
#' }
#' @source \url{Need citation to paper}
"biomarkers"
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