The high prevalence of hazelnut allergy in individuals with allergies to other nuts and seeds can be explained by the high homology between the allergenic structures (Table 7): On the one hand, PR-10 proteins play a role and are responsible for the widespread cross-sensitization to several PR-10 proteins of various fruits, seeds, and nuts; on the other hand, storage proteins such as Cor a 14 (2S albumin), Cor a 9 (11S globulin), and Cor a 11 (7S vicilin) are relevant and have been associated with severe allergic reactions [99, 100]. Here, ALB is linked to allergic disease.