Abstract
Summary
From human serum (syphilitic and non-syphilitic) a fraction comprising from 0.6 to 1% of the total serum proteins, and containing an inhibitor for certain serological reactions such as the Kline and Kahn tests, has been isolated by means of chemical fractionation with phosphate buffers. This inhibitory substance as it occurs in serum, may be reversibly inactivated by hypertonic solutions of electrolytes, and irreversibly by heat.
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