Figure 6. Representative hematoxylin and eosin stained lung sections of WBP challenged mice only sensitized toward Bet v 1 protein (A) or sensitized and then treated with ST[rBet v 1]. (B) Mature eosinophils are visible as small cells with donut-shaped blue nucleus of compact chromatin surrounding the pink cytoplasm (original magnification 40×). WBP: White Birch Pollen extract.