has role material entity material to be added role material to be added 10/26/09: This defined class is used as a 'macro expression' to reduce the size of the IEDB export 2010/02/24 Alan Ruttenberg: I think this might generate confusion as the common use of the term would consider something to be a specimen during the realization of the role, not only if it bears it. However having this class as a probe, or for display, or as a macro might be useful. Ideally we would mark or segregate such classes A mixture of peptides that is being added into a cell culture. IEDB a material that is added to another one in a material combination process material to be added ready for release