Define the term collagens. Explain the structural difference between various types of collagens with suitable examples. 

Collagen is a family of structural proteins that form a major component of the extracellular matrix in various connective tissues throughout the human body. It provides strength, support, and elasticity to tissues and organs, playing a vital role in maintaining the integrity of skin, bones, tendons, ligaments, and cartilage. Collagens are composed of long, fibrous molecules made from the amino acids glycine, proline, and hydroxyproline, arranged in a triple-helix structure. This helical structure is what gives collagen its strength and stability. Collagens are primarily synthesized by fibroblasts, but they are also produced by other cell types such as chondrocytes and osteoblasts.

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