45. Which two proteins form the extracellular fibers found in all connective tissues?
(A) Collagen and elastin
(B) Actin and myosin
(C) Keratin and collagen
(D) Fibrin and fibrinogen
(E) Tubulin and elastin

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統計: A(7), B(0), C(0), D(0), E(0) #3852899