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106 THE PROTEIN SUBSTANCES.
obtained on cleavage, but we must bear in mind that the figures, because
of the difficulty in the quantitative estimation, are not quite exact, but
must be considered as minimum values. As a representative of the glob-
ulin group we give fibrin, which is a coagulated globulin; and as repre-
sentative of the phosphoprotein group, besides casein also ovovitellin,
although not quite pure. The results are based on 100 parts of the
substances.
The proteins occurring in the plant kingdom either in the seeds or
tuberes belong chiefly to the globulins, which correspond essentially in
properties to the animal globulins. Besides these many other less
abundant proteins occur, which like the albumins are soluble in water,
while toward certain salts they behave like globulins. It is not clear
whether the phosphorized plant proteids contain their phosphorus as
impurities or whether they are the same as the animal phosphoproteins.
In seeds there occur also proteins, which are not represented in the animal
kingdom and of these we must especially mention the prolamines. They
are soluble in alcohol and besides this they are characterized by not
yielding any lysine on hydrolysis.
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