regulates gene expression and impacts hair follicle activity
miR-221 is a type of microRNA, which are small, non-coding RNA molecules that play a role in regulating gene expression. Specifically, miR-221 has been found to influence cell cycle progression and has been implicated in various biological processes, including cancer development and hair growth regulation. In the context of hair, miR-221 can affect the activity of hair follicle cells, potentially contributing to conditions like alopecia.