Réticuline
The réticuline is made up of fibrillae of Collagène of the type 3, and thus presents the same characteristic striation in electronic Microscopie. It forms fibrillae finer than collagen fibers, immature fibers of collagen which are independent from/to each other, but seem on an image microscopy to form a latticed network: it is said that they are apparently braided. As for collagen fibers they are assemlées out of fibers by the fibroblast
The réticuline is component extracellular matrices, one finds it in particular in the hematopoietic fabrics, but also in the kidney, the liver and endocrine glands.