It is very interesting that the length of the fibrils obtained in these tests (100-600 nm) is comparable to the length of type 1 skin collagen fibrils (monomers are about 280-300 nm long) . On the other hand, the diameter of peptide fibrils studied in this work (3-20 nm) is slightly larger than the diameter of a single type I collagen molecule (1.5 nm) but very similar to the diameter of collagen microfibrils present in the skin. Five monomers assemble into one microfibril, which is about 4 nm in diameter. The diameter of a mature collagen fibril is about 30 -1000 nm and depends on the degree of its maturity, the type of collagen it forms and the tissue in which it occurs. Many microfibrils may associate to form collagen fibrils, and in skin the diameter of these fibrils can range from 30 to 300 nm.