leukocyte homeostasis myeloid cell homeostasis mast cell homeostasis biological_process Note that this term represents the return of mast cell levels to stable numbers following an immune response as well as the proliferation and elimination of mast cells required to maintain stable numbers in the absence of an outside stimulus. The process of regulating the proliferation and elimination of mast cells such that the total number of mast cells within a whole or part of an organism is stable over time in the absence of an outside stimulus. GO:0033023