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- W2409298082 abstract "Partial purification of soluble products of guinea-pig lymphocyte activation (LAP) was undertaken by fractional precipitation with ammonium sulphate, ion-exchange and Sephadex chromatography, and by immune precipitation of inducing antigen and of contaminating serum protein. During these purification steps the activity of macrophage migration-inhibition factor (MIF) was concentrated up to 1300-fold and separated from inducing antigen and serum protein. An endpoint assay was devised for expressing antigen-induced MIF activity of LAP fractions as weights of material giving 30% inhibition of migration (MI30 doses).MIF activity precipitated between 50% and 80% saturated ammonium sulphate and eluted from DEAE-cellulose at pH 7·9 at intermediate salt concentrations (0·03–0·2 M phosphate). On Sephadex gel filtration MIF activity was concentrated in fractions of molecular weight range 56,000–82,000 with a smaller amount of activity eluting from 20,000–56,000. After immune precipitation of extraneous protein and elution from DEAE-cellulose, LAP material was found to have an MI30 dose of 0·4 μg.Materials representative of antigen and serum protein-depleted MIF were selected for intralymphatic injection in order to determine whether MIF-rich LAP fractions were able to induce paracortical distension in guinea-pig lymph nodes (see following paper)." @default.
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- W2409298082 date "1972-01-01" @default.
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- W2409298082 title "Role of lymphocyte activation products (LAP) in cell-mediated immunity. I. Preparation and partial purification of guinea-pig LAP." @default.
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