Complex sentence: The mucin-1 protein is involved in the creation of a mucus-like substance that coats the surface of different small tubules in the body, it is expressed on distal tubular cells in the kidney.
Split into simpler sentences: The mucin-1 protein is involved in the creation of a mucus-like substance that coats the surface of different small tubules in the body. It is expressed on distal tubular cells in the kidney.