Size of azurophil lysosomes of human PMNs determined by stereological morphometry.

The most striking feature of polymorphonuclear leukocytes is the presence of the subcellular organelles known as lysosomes. The peroxidase positive azurophil (primary) lysosomes are generally described in textbooks and the journal literature as predominantly ellipsoidal and approximately 500 nm in size. However, there appears to be no discovery research in the literature establishing that value.