EGR1 and neoplasm: The dedifferentiation, proliferation, and maintenance of the undifferentiated state of coelomic epithelial cells can involve Ef-elf, Ef-prdm9, Ef-klf1/2/4, and Ef-egr1. Ef-ELF belongs to the Ets family, whose members are powerful regulators of cell proliferation, angiogenesis, hematopoiesis, tumor transformation, and differentiation [179,180].