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G1 Phase
First Gap Phase; G1a Phase; G1b Phase; Gap Phase 1; 1, Gap Phase; First Gap Phases; G1 Phases; G1a Phases; G1b Phases; Gap Phase, First; Gap Phases, First; Phase 1, Gap; Phase, First Gap; Phase, G1; Phase, G1a; Phase, G1b; Phases, First Gap; Phases, G1
The period of the CELL CYCLE preceding DNA REPLICATION in S PHASE. Subphases of G1 include "competence" (to respond to growth factors), G1a (entry into G1), G1b (progression), and G1c (assembly). Progression through the G1 subphases is effected by limiting growth factors, nutrients, or inhibitors.