- An albuminous human body created in little quantity by the peptic food digestion of proteids. It could be converted into peptone by pancreatic juice, although not by gastric juice.
- A proteinaceous body created in tiny quantity because of the peptic food digestion of proteids. It may be became peptone by pancreatic liquid, not by gastric juice.
- A proteid substance intermediate between albumin and peptone, gotten by neutralizing an acid solution which pepsin has acted on a proteid body. It closely resembles syntonine.