<unk> s are a family of large, heavily glycosylated proteins. Although some<unk> s are membrane-bound due to the presence of a hydrophobic membrane-spanning domain that favors retention in the plasma membrane, the concentration here is on those<unk> s that are secreted on mucosal surfaces and saliva.
Mucin
Muconic acid
Glycoprotein
Phlyctenule
Pectin
Lanolin
Kerosene
Glycosaminoglycan