Abstract
Using antisera produced against a serum lectin we have shown by employing immunocytofluorescence that hemocytes from the oyster, Crassostrea virginica, possess a lectin which is situated on the external surface of the cell membrane. The antisera block the binding of hemocyte microsomes to protease-treated vertebrate erythrocytes, thus confirming that the hemocyte membrane lectin is serologically related to the serum lectin. The major serum lectin has an apparent mass of 34,000. Flow cytometry has revealed that the distribution of the surface lectin on hemocytes represents a heterogeneous expression on a population basis, but no discrete cell subpopulations can be identified.
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