Molecules produced by fibroblasts aiding tissue repair are Glycosaminoglycans (GAGS).

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The main idea is that fibroblasts secrete components of the extracellular matrix that support tissue repair. Glycosaminoglycans are long, sugary chains that attach to core proteins to form proteoglycans. These GAGs create a hydrated, gel-like environment in the repair site, which helps with cell movement, diffusion of nutrients and signaling molecules, and stabilization of the new tissue. Because fibroblasts actively produce glycosaminoglycans as part of rebuilding the matrix, identifying GAGs as the molecules aiding tissue repair fits well with how wound healing is supported at the molecular level. While collagen is also produced by fibroblasts and is crucial for strength, the statement specifically highlights this class of molecules, and melanin is made by pigment cells rather than fibroblasts, with elastin playing a different role in elasticity.