Epoetin zeta is identical in its amino acid sequence and similar in carbohydrate composition to endogenous human erythropoietin that has been isolated from the urine of anaemic patients.
Dzeetaepoetiin on identne oma aminohapete järjestuselt ja karbohüdraadi koostiselt endogeensele inimerütropoetiinile, mis on isoleeritud aneemiliste patsientide uriinist.