EOG8Q5C4J GO:0007623 2/14 circadian rhythm biological_process "Any biological process in an organism that recurs with a regularity of approximately 24 hours." [GOC:bf, GOC:go_curators] EOG8Q5C4J GO:0005615 1/14 extracellular space cellular_component "That part of a multicellular organism outside the cells proper, usually taken to be outside the plasma membranes, and occupied by fluid." [ISBN:0198547684]