Human tissue surfaces are coated with mucins. a family of macromolecular sugar-laden proteins serving diverse functions from lubrication to the formation of selective biochemical barriers against harmful microorganisms and molecules. Membrane mucins are a distinct group of mucins that are attached to epithelial cell surfaces where they create a dense glycocalyx facing the extracellula... https://www.sourcebmxers.shop/product-category/bmx-headsets/