In the bone marrow, stem cells produce erythrocytes which lose their nucleus and function for a few months in the bloodstream before they die. Erythrocytes never divide. Based on this information, erythrocytes
A. reverse from G2 to G1.
B. halt in the midst of the S phase.
C. continually cycle but simply fail to go through cytokinesis.
D. leave the cell cycle in a G0 phase, after exiting G1.
E. leave the cell cycle in a G3 phase, which immediately follows G2.
Answer: D
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