α2-Macroglobulin, a carrier of folic acid activity (FAA), was isolated from fresh human serum by DEAE Sephadex A-50 gel chroma-, tography. The FAA content of the maximum with α2-macroglobulin was 136 pg/mg protein and constituted 42% of the FAA eluated with the totalproteins from the chromatography column. Theresults was corroborated by controlled retesting.
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© 1972 S. Karger AG, Basel
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