A collagen homotrimer of alpha1(VII) chains; type VII collagen triple helices form antiparallel dimer, which in turn associate laterally to form anchoring fibrils that connect type IV collagen in the basal lamina to plaques in the underlying connective tissue.

A collagen heterotrimer containing type VIII alpha chains; [alpha1(VIII)2]alpha2(VIII) and alpha1(VIII)[alpha2(VIII)]2 trimers have been observed; type VIII collagen triple helices associate to form regular hexagonal nets.

A collagen heterotrimer containing type XI alpha chains in alpha1(XI)alpha2(XI)alpha3(XI) trimers; type XI collagen triple helices associate to form fibrils.

Any collagen polymer associated with collagen fibrils and in which the collagen monomers contain two or more relatively short triple-helical domains connected by non-triple-helical sequences; the acronym FACIT stands for fibril-associated collagen with interrupted triple helix.

A collagen heterotrimer containing type IX alpha chains in alpha1(IX)alpha2(IX)alpha3(IX) trimers; type IX collagen triple helices associate to form a structure that links glycosaminoglycans to type II collagen fibrils.

A collagen homotrimer of alpha1(XII) chains; type XII collagen triple helices may link sheet-forming or fibrillar collagens to other structures.

A collagen homotrimer of alpha1(XIV) chains; type XIV collagen triple helices may link sheet-forming or fibrillar collagens to other structures.

Catalysis of the release of ammonia or one of its derivatives, with the formation of a double bond or ring. Enzymes with this activity may catalyze the actual elimination of the ammonia, amine or amide, e.g. CH-CH(-NH-R) = C=CH- + NH2-R. Others, however, catalyze elimination of another component, e.g. water, which is followed by spontaneous reactions that lead to breakage of the C-N bond, e.g. L-serine ammonia-lyase (EC:4.3.1.17), so that the overall reaction is C(-OH)-CH(-NH2) = CH2-CO- + NH3, i.e. an elimination with rearrangement. The sub-subclasses of EC:4.3 are the ammonia-lyases (EC:4.3.1), lyases acting on amides, amidines, etc. (EC:4.3.2), the amine-lyases (EC:4.3.3), and other carbon-nitrogen lyases (EC:4.3.99).