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Demonstration of concanavalin A receptors on Leptomonas pessoai cell memebrane.

Leptomonas pessoai promastigotes cultivated in a synthetic medium were agglutinated with concanavalin A (ConA). Agglutination was predominantly of the flagellar-flagellar type, and was inhibited with sucrose or alpha-methyl-D-mannoside. Cell surface polysaccharides and/or glycoproteins were demonstrated by several cytochemical methods at the fine-structural level. A Con A-horseradish peroxidase-diaminobenzidine (DAB) technic was used to detect Con A receptors in the pellicular membrane of the flagellar pocket region and in the flagellar membrane proper. Somewhat less of the Con A-DAB reaction product was observed in the pellicular membrane enclosing the rest of the cell.