SRC and osteopetrosis: For example, the kin() function denotes that an entity acts as a kinase, in some cases, however, the sentence doesn’t express the function at all, as in ‘Mutant src(−/−) mice have osteopetrosis resulting from defective osteoclasts (increased apoptosis).’ (PMID: 11157779) with its corresponding BEL statement ‘kin(p(MGI:Src)) decreases path(MESHD: Osteopetrosis)’.