The Proteins volume I part A - 548 s.

Proteins commonly occur in complex mixtures. In some of these mixtures the number of proteins is relatively small and one variety often predominates, as does casein in milk, hemoglobin in the lysate of the mammalian erythrocyte, or egg albumin in the white of the avian egg. 

The Proteins volume I part B - 1115 s.

Protein molecules are large and unstable; they are also extraordinarily reactive, and in extremely diverse ways. They form complexes, of varying stability, with almost all anions and cations, with lipides, with carbohydrates, and with one another.

The Proteins volume II part A - 661 s.

Nucleic acids are found in all living cells whether animal or vegetable, and in association with proteins are located in all systems responsible for the multiplication of cell constituents and for protein syntheisis...

The Proteins volume II part B - 1418 s.

The all- important purpose of a circulatory system is obviously the convection of metabolities...