The use of the isolated perfused liver to detect alterations to plasma proteins.

that whilst exchange may play only a small part in normal protein synthesis in vivo, it may become a dominant route for amino acid incorporation in vitro when cellular organization is disrupted or modified. 3. The radioactivity in crude enzymic hydrolysates of yeast or Chlorelta protein is much more rapidly incorporated into ribonuclease than is the activity of purified hydrolysates. The activating factor has not been identified.