Phenomena and Processes

G1 Phase

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.

National Library of MedicineMedical Subject Headings2026

Structured Summary

Abstract

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.

MeSH Record

Classification

Broader headings

Narrower headings

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MeSH Record

Synonyms

19 entry terms
  • First Gap Phase
  • Gap Phase 1
  • First Gap Phases
  • G1 Phases
  • Gap Phase, First
  • Gap Phases, First
  • Phase 1, Gap
  • Phase, First Gap
  • Phase, G1
  • Phases, First Gap
  • Phases, G1
  • G1a Phase
  • G1b Phase
  • G1a Phases
  • G1b Phases
  • Phase, G1a
  • Phase, G1b
  • Phases, G1a
  • Phases, G1b

MeSH Record

Aspects Covered

6 allowable subheadings

Indexed with the subheadings drug effects, ethics, genetics, immunology, physiology, radiation effects.

MeSH Record

History Note

91

MeSH Record

Previous Indexing

  • Cell Division (1966-1977)
  • Interphase (1978-1990)

MeSH Hierarchy

Tree Number

  1. G04.144w.500w.320w

AMA Style

References

  1. National Library of Medicine. G1 Phase. Medical Subject Headings (MeSH). 2026. Unique ID D016193. http://id.nlm.nih.gov/mesh/2026/D016193
  2. G1 Phase. In: Wikipedia. https://en.wikipedia.org/wiki/G1_phase
  3. G1 Phase. In: Wikidata. https://www.wikidata.org/wiki/Q306383