is about participates in has role identifier proper name Homo sapiens specimen collection donor case ID Alice Nzinga An identifier that refers to a specimen donor who is participating in specimen collection process for tissue procurement purposes and is usually assigned at the time of donor procurement. http://biospecimens.cancer.gov/resources/sops/GTEx_SOPs/II/A/GTEx%20Tissue%20Procurement%20SOP%20%28PR-0004%20v1.2.1%29.pdf