Baggiolini M, Amherdt M, Orci L
Experientia. 1976 Nov 15;32(11):1400-1. doi: 10.1007/BF01937399.
Freeze fracturing of azurophil and specific granules from rabbit polymorphonuclear leukocytes reveals unusually high numbers of intramembrane particles. Both granules have significantly higher particle densities on the B than on the A fracture face.