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. Author manuscript; available in PMC: 2010 Jan 1.
Published in final edited form as: PET Clin. 2009 Jan 1;4(1):1–15. doi: 10.1016/j.cpet.2009.04.012

Figure 1.

Figure 1

Cartoon showing the characteristics of the P and Q cells in solid tumors. DNA is synthesized in the S phase of the cell cycle. TK-1 is normally synthesized at the G1/S boundary and is active until early G2. Proliferating cells are Ki-67-positive, whereas quiescent cells, including both quiescent tumor cells and quiescent normal cells, are Ki-67 negative.