Table 1.

Types of dermal ECM collagens and their localization.

Collagen Types	Localization
Fiber-forming (fibrillar) collagens
Large fiber-forming collagens
Type I	Reticular dermis layer predominantly
Type III	Papillary dermis layer predominantly
Small (minor) fiber-forming collagens
Type V	Both layers of the dermis
Non-fibrillar collagens
FACIT collagens
Type XII	Papillary dermis layer
Type XIV	Reticular dermis layer
Type XVI	Papillary dermis layer
Type XXII	Papillary dermis layer
Collagens forming network-like structures
Basement membrane collagens
Type IV	Basement membrane
Collagens of anchoring fibrils
Type VII	Fibrils at the border of dermis and epidermis
Collagens of microfibrils
Type VI	Microfibrils in both layers of the dermis
Transmembrane collagens
Type XIII	Cellular membranes