Koepke et al. (1990)  reported 3 IgE binding bands running at 66-68 kDa.
De las Marinas et al. (1998)  reported several IgE binding polypeptides including a prominent 50 kDa band. The IgE binding was inhibited by almond extract.
Senna et al (2000)  reported IgE binding to polypeptides running at 14-16, 25, 32, 35, 46, 55 and 67 kDa. The IgE binding to the 35-67 kDa bands from pine pollen extract could be inhibited by pine nut extract.
Garcia-Menaya et al. (2000)  found IgE binding to a 17 kDa polypeptide which disappeared on reduction.
Añó et al. (2002)  found IgE binding to polypeptides running at 30 kDa and 44 kDa. This could be inhibited by peanut extract but not almond extract.
Ibanez et al (2003)  found double IgE binding bands at 17 kDa with weak IgE binding to a band at 37 kDa band with one serum and strong IgE binding to a 50 kDa band with the other serum. There was no IgE cross-reactivity to pine pollen or other nuts.