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. 1999 Jun 21;189(12):1885–1894. doi: 10.1084/jem.189.12.1885

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FC1Ps do not induce histamine release from basophil- enriched PBMC in vitro. Mean percentage histamine release induced by whole cat dander extract (ALK; 0.2, 2, 20, 100, and 200 μg/ml) and FC1P (five increasing concentrations up to 100 μg/ml [5 × 10⁻⁵ M]) from basophil-enriched leukocytes (n = 11; five LAR responders and six nonresponders).