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Neutralization of the biological effect of GM‐CSF by different i.v. immunoglobulin preparations. For this, the TF‐1 cell‐line was stimulated with approximately 1·0 IU/ml of GM‐CSF in the presence or absence of various immunoglobulin products. Symbols for individual products are: A, ▪ B, ▴ C, □ and E, •.
