1 3 0 http://semanticscience.org/resource/SIO_001435 chemical-chemical association 'chemical-chemical association' SubClassOf 'refers to' exactly 2 'chemical entity' http://semanticscience.org/resource/SIO_001437 gene-gene association 'gene-gene association' SubClassOf 'association' 'gene-gene association' SubClassOf 'refers to' exactly 2 'gene' http://semanticscience.org/resource/SIO_001438 protein-protein association 'protein-protein association' SubClassOf 'association' 'protein-protein association' SubClassOf 'refers to' exactly 2 'protein' http://semanticscience.org/resource/SIO_001436 disease-disease association 'disease-disease association' SubClassOf 'association' 'disease-disease association' SubClassOf 'refers to' exactly 2 'disease'