“…1971 for review), fuconiucins, sialomucins, and sulphomucins; they are synthesised by the sequential addition of hexoses onto the polypeptide chain by glycosyl transferases. In the lung, the principal glycosyl transferases are as follows: galactosyl transferase, N-acetyl galactosaminyl transferase, sialyl transferase, fucosyl transferase and mannosyl transferase (Baker and Sawyer, 1975; Levrat and Louisot, 1979). These enzymes are localised in the endoplasmic reticulum (microsomal fraction; Phelps, 1978), the Golgi apparatus (Chabaud el til, 1974) and in the mitochondria (mannosyl-, sialyl-and Nacetyl-glucosaminyl-transferases; Morel is et 01, 1974; Gateau et ( i f .…”