Preparation of drugs
The following drugs were used: benralizumab (Creative Creative Biolabs Inc., NY, USA) diluted in distilled water, histamine (Sigma-Aldrich, Milan, Italy) diluted in distilled water, and mepolizumab (Creative Creative Biolabs Inc., NY, USA) diluted in distilled water. Compounds were stored in small aliquots at -80°C until their use.