Many other common diseases are caused by autoimmunity such as juvenile diabetes and low thyroid disease. It has been recently discovered that some persons who suffer with hives or angioedema also have an autoimmune disease. In these cases, autoantibodies have been formed that bind to the Fc-receptor on mast cells.
Lesson Summary. Chitin is a primary component in the exoskeletons of arthropods and crustaceans and is also found in the cell walls of fungi. It's a polysaccharide, and it's excreted by the epidermal cells in arthropods. But, it can't grow with the animal, so shedding becomes necessary.
chitin ous layer [Gr. chiton-an outer covering, tunic]. A thick, clear layer of an Ascaris egg shell which is composed of chitin and protein and provides a protective coating located between the fertilization membrane and the ascaroside layer.hiton, a tunic, undergarment]. A structural polysaccharide of an amino sugar found in many fungi and in the exoskeleton s of all arthropods. chlorophyll ... ~ /KITE-in/ A structural polysaccharide that is the main component of the exoskeleton s of all arthropods and the cell wall s of fungi.