Figure 5

B lymphocyte_Antigen as an instance of the "Cell_Molecule_Interaction" concept. This instance is shown as B_Ag in Fig. 2. In CMM, Ag is represented by p185. Note that the interaction between the membrane IG, on the surface of the B lymphocyte, and the antigen is also an instance of the "Molecule_Molecule_Interaction". This example illustrates (as the following figures) how the IMGT-ONTOLOGY concepts of interactions allow to bridge the gap between the cell and molecule levels.