Purity > 85% as determined by SDS-PAGE. MW: 28.8kDa. Partial: 36-240aa. N-terminal 6xHis-tagged. Homo sapiens (Human). Coats the epithelia of the intestines, airways, and other mucus membrane-containing organs. Thought to provide a protective, lubricating barrier against particles and infectious agents at mucosal surfaces. Major constituent of both the inner and outer mucus layers of the colon and may play a role in excluding bacteria from the inner mucus layer.