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Reference.org
Proteoglycan 4
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<p>Proteoglycan 4 or lubricin is a <a href="/facts/Proteoglycan/SFbGPK0R">proteoglycan</a> that in humans is encoded by the <i>PRG4</i> <a href="/facts/Gene/e1swwPY6">gene</a>. It acts as a <a href="/facts/Joint/D70qxsey">joint</a>/<a href="/facts/Synovial_membrane/kWEY5l7V">boundary</a> lubricant. </p>