Appl Environ Microbiol. 1973 March; 25(3): 325-326
Copyright © 1973 American Society for Microbiology. All Rights Reserved.
1 Research and Development Division, Smith Kline and French Laboratories, Philadelphia, Pennsylvania 19101
ABSTRACT
An antibody-free human serum fraction has been prepared by ammonium sulfate precipitation. This fraction can be substituted for whole serum in the production of optimal yields of interferon by induced human leukocytes.
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