<P> The elastic fiber is formed from the elastic microfibril (consisting of numerous proteins such as microfibrillar - associated glycoproteins, fibrillin, fibullin, and the elastin receptor) and amorphous elastin . </P> <P> The microfibril scaffolds and organizes the deposition of amorphous elastin . Amorphous elastin forms from monomers of soluble tropoelastin which is insolubilized and crosslinked into amorphous elastin by lysyl oxidase . Lysyl oxidase reacts with specific lysine residues and by oxidative deamination generates reactive aldehydes and allysine . </P> <P> These reactive aldehydes and allysines can react with lysine and other allysine residues to crosslink and form desmosine, isodesmosine, and a number of other polyfunctional crosslinks that join surrounding elastin molecules to build an elastin matrix and elastic fiber . These unique crosslinks are responsible for elastin's elasticity . </P> <P> Elastic fibers are found in the skin, lungs, arteries, veins, connective tissue proper, elastic cartilage, periodontal ligament, fetal tissue and other structures . Elastic fibers are absent from scarring, keloids and dermatofibromas and they are decreased greatly, or are absent in anetodermas . </P>

Where are elastic fibres found in the aorta