<unk>  is a rare autosomal recessive genetic condition due to a mutation in the gene proteoglycan 4 (PRG4) – a mucin-type glycoprotein that acts as a lubricant for the cartilage surfaces. This gene is also known as lubricin.
Camptodactyly-arthropathy-coxa vara-pericarditis syndrome
Peters-plus syndrome
Beare–Stevenson cutis gyrata syndrome
Arthrogryposis–renal dysfunction–cholestasis syndrome
picture of Marfan syndrome
Bowen–Conradi syndrome
Senior–Løken syndrome
Barraquer–Simons syndrome