Cheek swabs are widely used in pediatric epigenetic studies, but changes in their cellular composition with age are unclear. Here the authors show that buccal epithelial cells decline with age until adolescence, then stabilize, while variability increases with age, impacting the precision of tools like the PedBE clock in pediatric epigenetics.
- Sarah M. Merrill
- Chaini Konwar
- Michael S. Kobor
