Source:http://linkedlifedata.com/resource/umls/id/C0079395
MSH: 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.,GO: A cell cycle process comprising the steps by which a cell progresses through G1 phase, one of two 'gap' phases in the cell cycle; G1 is the interval between the completion of DNA segregation (usually by mitosis or meiosis) and the beginning of DNA synthesis. [GOC:ai, GOC:dph, GOC:mah],NCI: Phase of the cell cycle preceding DNA synthesis (Gap 1 phase). The subphases of G1 include competence, entry (G1a), progression (G1b), and assembly (G1c), based on the effects of limiting growth factors, nutrients, or inhibitors.