title: Immunocytochemical demonstration of a humoral defense factor in blood cells (Amoebocytes) of the pond snail, Lymnaea stagnalis.
abstract: Monolayers of blood cells (amoebocytes) and sections of connective tissue and of amoebocyte pellets of the freshwater pulmonate gastropod Lymnaea stagnalis were stained immunocytochemically with antisera to snail agglutinin/opsonin. The presence of this substance was demonstrated light microscopically both in the cytoplasm and on the cell membrane of amoebocytes. This suggests that amoebocytes synthesize agglutinin/opsonin, and bear it at their surface as receptors for foreign materials.
mesh_terms: D000373:Agglutinins / Q000032:analysis*; D000486:Allergy and Immunology; D000818:Animals; D001773:Blood Cells / Q000648:ultrastructure; D003238:Connective Tissue / Q000276:immunology; D003593:Cytoplasm / Q000276:immunology; D007124:Immunoenzyme Techniques; D008195:Lymnaea / Q000276:immunology*; D009895:Opsonin Proteins / Q000032:analysis*; D014617:Vacuoles / Q000276:immunology
chemical_list: D000373:Agglutinins; D009895:Opsonin Proteins