http://en.wikipedia.org/wiki/Anatomy
The extracellular matrix contains proteins, the chief and most abundant of which is collagen. Collagen plays a major part in organizing and maintaining tissues. The matrix can be modified to form askeleton to support or protect the body. An exoskeleton is a thickened, rigid cuticle which is stiffened by mineralisation, as incrustaceans or by the cross-linking of its proteins as in insects. An endoskeleton is internal and present in all developed animals, as well as in many of those less developed.
The extracellular matrix contains proteins, the chief and most abundant of which is collagen. Collagen plays a major part in organizing and maintaining tissues. The matrix can be modified to form askeleton to support or protect the body. An exoskeleton is a thickened, rigid cuticle which is stiffened by mineralisation, as incrustaceans or by the cross-linking of its proteins as in insects. An endoskeleton is internal and present in all developed animals, as well as in many of those less developed.
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