intracellular zinc ion homeostasis obsolete zinc ion homeostasis https://github.com/geneontology/go-ontology/issues/24464 true The reason for obsoletion is that the term is not clearly defined and usage has been inconsistent. For homeostasis terms, we would like to specify whether the homeostasis takes place intracellularly or at the level of the organism. biological_process zinc homeostasis OBSOLETE. Any process involved in the maintenance of an internal steady state of zinc ions within an organism or cell. GO:0055069 renal zinc excretion