What are the key regulatory proteins and signaling pathways involved in the transition from quiescence (G0) to the proliferative cell cycle, and how do extracellular signals, growth factors, and cell cycle inhibitors modulate the decision to enter or exit the cell cycle in response to environmental cues and cellular demands?  

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The transition from quiescence G0 to the proliferative cell cycle is tightly regulated by a complex network of regulatory proteins and signaling pathways This transition is crucial for maintaining tis... View the full answer