Which chemical cannot be classified into a protein?
A. heparin
B. erythropoietin
C. interleukin
D. fibrin
查看答案
The liquid portion of blood is termed______
Platelets are produced by certain giant cells termed___
some monocytes enter the tissues and mature into phagocytic cells termed_
Leukocytes protect us against foreign substances. Some engulf foreign material by the process of___
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