Table 2.

Expression pattern of extracellular matrix components in human meibomian gland.

	Acinar	Ductal	Junctional
ECM component
1.Collagens
Type IV collagen
α1(IV) chain	+	+	+
α2(IV) chain	+	+	+
α3(IV) chain	–	–	–
α4(IV) chain	–	–	–
α5(IV) chain	+	+	+
α6(IV) chain	+	+	+
2. Glycoproteins
Laminin α2 chain	+	–	+
Laminin β1 chain	+	–	+
Tenascin-C	–	–	+
3. Proteoglycans
Perlecan	+	–	+
Agrin	–	–	–
Endostatin	–	–	–