Publications by authors named "C A Mays-Ichinco"

Recombinant murine interleukin-4 (muIL-4) expressed in COS-7 monkey kidney cells was purified to homogeneity by sequential CM-Sepharose, Sephadex G-100 chromatography and mono-S FPLC to a specific activity of 6.10(7) units per mg of protein based on an in vitro HT-2 cell proliferation assay. Two electrophoretic variants, designated a and b, which migrated on SDS-PAGE as a closely spaced doublet with Mr 19,000, were present in the final product.

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We have purified recombinant human interleukin 4 (huIL-4), formerly named B-cell stimulatory factor-1, from supernatants of COS-7 monkey kidney and L-929 cells transfected with the cDNA for huIL-4. The purified protein exhibited a specific activity of 2.6 X 10(7) units/mg in a T-cell proliferation assay and consisted of multiple components on sodium dodecyl sulfate-polyacrylamide gel electrophoresis exhibiting Mr values of 15,000, 18,000, and 19,000.

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