In vitro protein synthesis by human slivary glands. II. Synthesis of proteins specific to saliva and other excretions.

Nine proteins not found in serum were synthesized by human salivary glands. Six were specific to saliva. These six proteins were synthesized in tissue cultures by submandibular glands, but only three of them were synthesized by parotid glands. One was identified as amylase. Lactoferrin, an iron-binding protein common to various excretions was synthesized in large amounts by submandibular and parotid glands. Two proteins common to gastric juice and saliva, were synthesized by human salivary glands as well as by gastric mucosa.