Equivalence relations between MP classes and EQ descriptions. Equivalence relations between two MP classes and their equivalent EQ descriptions. Here we treat MP 'degeneration' terms as in the PATO quality (Q) 'degenerate', rather than the process of degeneration. Here the bearer entities (E) are represented in the OBO Cell Ontology (CL). The EQ notation can be translated to logical expressions using Table 2. The dotted line indicates a relationship in the MP that can be independently inferred by a reasoner. CNS, central nervous system.