Recombinant pollen allergens from birch (Betula pendula) and timothy grass (Phleum pratense) pollen allergens Bet v 1.0101 and Phl p 5.0101, referred to as Bet v 1 and Phl p 5 hereafter, were obtained from Biomay AG (Vienna, Austria). Ovalbumin (OVA) was purchased from InvivoGen (Toulouse, France) and was treated the same way as the allergens to serve as a negative control in the cell culture experiments described below. Protein stock solutions (1 mg mL−1) for chemical modification were prepared with pure water as described in Backes et al. (24 (link)).
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