Cyclin D

**Semantic type:** Amino Acid, Peptide, or Protein

**Definition:** A protein family that is synthesized during the G1 phase of the cell cycle and drives the G1/S phase transition through the positive regulation of cyclin-dependent kinase activity. There are 3 CCND genes in humans.

**Synonyms:** - CCND - Cyclin-D - G1/S-Specific Cyclin-D