cfu-eos cfu-eos cfu-eo is a colony forming unit that gives rise to eosinophils. some sources prefer the term "cfu-eos". it is also known as "heop". cfu-eosdetailsgives rise toeosinophilslocationbone marrowfunctioncolony forming unitidentifiersthh2.00.04.3.02010 anatomical terms of microanatomy