Coomassie stained gels. A; natural hazelnut OAP fraction. Indicated are the bands identified by mass-spectrometry. (1) contained little amounts of both oleosins, but the main constituent remained unidentified, (2) 11S globulin (AAL73404, Cor a 9) and (3) and (4) mainly consisted of both oleosins, AY224679 (Cor a 12) being the most abundant. In addition, a protein with similarity to caleosins was detected in these bands. B; Purified recombinant oleosin Cor a 12. Marker sizes are indicated.