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There was described and efficient and economical approach for the removal of toxic substances from normal and immune sera from various species of animals with the use of human placenta tissue. Purification brings about to perceptible losses of neither serum-specific activity nor the original volume. Being simple the method does not require any special equipment and can be used in conditions of low-volume or in laboratory production of serum preparations. There are considered as well possible origins of serum toxicity as mechanism of antitoxic activity of placenta.