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Disclosure of potential conflicts of interest: M. Arock has patents through CNRS (Centre national de la recherche scientifique) and ENS (Ecole normale sup erieure de Cachan) Cachan for human mast cell lines, preparations, and uses (WO 2013064639 A1). U. Raap has received research support and payment for lectures from Novartis Pharma. K. Hartmann has consultant arrangements with Novartis; has received payment for lectures from Abbvie, Biogen, and Novartis; and has received a research grant from Novartis. The rest of the authors declare that they have no relevant conflicts of interest.

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