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92 THE PROTEIN SUBSTANCES.
B. Albuminoids or Albumoids.
Keratins.
Elastin.
Collagen and glutin.
Reticulin.
(Fibroin, Sericin, Coilin, Cornein, Spongin, Byssus, and others.)
C. Cleavage Products of True Albuminous Bodies.
Alkali and Acid Albuminates.
Proteoses, Peptones, Polypeptides.
(Amino-acids.)
II. Compound Proteins.
. \Mucin substances,
[ Ichthulin, and others.
Nucleoproteins.
Chromoproteins J
Hcemoglobin,
| Hcemocyanin.
As there are two classifications recognized by English-speaking scien-
tists we will give the classifications adopted by the American Physio-
logical Society and the American Society of Biological Chemists and
also the British Medical Association.
Classification adopted by the American Physiological Society and
the American Society of Biological Chemists:
I. Simple Proteins.
A. Albumins.
B. Globulins.
C. Glutelins.
D. Prolamins (Alcohol-soluble proteins).
E. Albuminoids.
F. Histones.
G. Protamines.
II. Conjugated Proteins.
A. Nucleoproteins.
B. Glycoproteins.
C. Phosphoproteins.
D. Haemoglobins.
E. Lecithoproteins.
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