The epithelial cells of the Hassall's corpuscles in 11 human thymus glands (nine cases of myasthenia gravis and two glands from patients undergoing surgical correction of congenital heart disease) have been examined by electron microscopy. In every instance the epithelial cells have the cytoplasmic organelle complex necessary for ;export'-type secretory activity and in addition contain large nu...

Using a peroxidase-antiperoxidase method, the intracellular lysozyme (LZM) content of human blood cells, salivary corpuscles and nasal discharge cells was estimated after blockade of myeloperoxidase activity. The endogenous myeloperoxidase activity was entirely blocked by 0.3% hydrogen peroxide-methanol treatment in the polymorphonuclear leucocytes. In the peripheral blood of healthy subjects a...