PPP1R17 (Protein Phosphatase 1 Regulatory Subunit 17): PPP1R17 is a protein that functions as a regulatory subunit of protein phosphatase 1 (PP1). PP1 plays a key role in dephosphorylating target proteins and is essential for cell signaling, metabolism, and cell cycle regulation. PPP1R17 helps modulate the activity and specificity of PP1, influencing a range of cellular processes.