Proteoglycan 4

**Definition:** A proteoglycan involved in joint surface lubrication and encoded by the PRG4 gene. Altered expression occurs in some forms of ARTHRITIS.

**Tree numbers:** - D09.400.430.930.613 - D09.698.735.550 - D12.776.395.650.613

**Synonyms:** - Lubricating Glycoprotein-I - Lubricin - PRG4 Protein