ELECTRON-MICROSCOPIC MORPHOLOGY OF CYTOPLASMIC GRANULES FROM HORSE EOSINOPHIL LEUKOCYTES

The structure of specific granules from horse eosinophil leucocytes is still largely unknown. In this work, electron microscopical studies o f horse eosinophils reveal that the large cytoplasmic granules contain an external membrane, a matrix of less density, and a dense (non crys talline) core. Round vacuolar inclusions of matrix materials were ofte n observed within the cores. Horse eosinophil granules showed a consid erable heterogeneity, and three morphological types could be identifie d according to structural features of the core and matrix.