<prompt> The collagen triple helix structure is not found in -CytoplasmGolgi apparatusLumen of endoplasmic reticulumIntracellular vesicles  <response>: Triple helix formation occurs in endoplasmic reticulum at procollagen level.Triple helix of procollagen is packed into secretory intracellular vesicles in the Golgi-apparatus.These vesicles then secrete the procollagen into extracellular space where it is converted to tropocollagen collagen monomer.Tropocollagens aggregate into collagen fibrils which intern become extensively cross-linked to form collagen fibers. 