PPP1R17 (Protein Phosphatase 1 Regulatory Subunit 17): PPP1R17 is a protein that acts as a regulatory subunit of protein phosphatase 1 (PP1). PP1 is crucial for dephosphorylating target proteins and is vital for cell signalling, metabolism, and the regulation of the cell cycle. PPP1R17 assists in modulating the activity and specificity of PP1, affecting a variety of cellular processes.