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Dogfish peripheral blood leucocytes were examined by electron microscopy after the injection of colloidal carbon. The cells were classified as lymphocytes, plasma cells, monocytes, thrombocytes and granulocytes. The granulocytes were further classified into four types according to the structure of their granules. Monocytes, thrombocytes and two types of the granulocytic cells were phagocytic.
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Morrow et al. (1980) studied this question.
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