occurs in occurs in has output has output produces produces uberon produces RO:0003000 produces external Note that this definition doesn't quite distinguish the output of a transformation process from a production process, which is related to the identity/granularity issue. a produces b if some process that occurs_in a has_output b, where a and b are material entities. Examples: hybridoma cell line produces monoclonal antibody reagent; chondroblast produces avascular GAG-rich matrix. produced_by produced by produced by material entity material entity pending final vetting