has_participant

Has_participant is a primitive instance-level relation between a process, a continuant, and a time at which the continuant participates in some way in the process. The relation obtains, for example, when this particular process of oxygen exchange across this particular alveolar membrane has_participant this particular sample of hemoglobin at this particular time.

has participant

this investigation has participant this investigator,this process has participant this input material (or this output material),this blood coagulation has participant this blood clot

http://www.obofoundry.org/ro/#OBO_REL:has_participant