endogenous erythroid colony

== English == === Noun === endogenous erythroid colony (plural endogenous erythroid colonies) (hematology) A diagnostic laboratory finding where erythroid progenitor cells from a patient’s bone marrow or peripheral blood grow into colonies in vitro without the addition of exogenous erythropoietin, used as a marker of abnormal stem cell behavior. Synonym: EEC (initialism)