Abstract
A phagocytosis-stimulating activity against the normally nonphagocytosable cells of Bacillus thuringiensis subtoxicus develops in the hemolymph of larvae of Galleria mellonella at different periods after injection with readily phagocytosable latex beads. The phagocytosis-stimulating factor can be transferred into new animals with the cell-free hemolymph of treated larvae. It is not detectable in the hemolymph of normal larva but is present in the supernatant of homogenates of the skin. The fractionation of activated hemolymph on Sephadex shows that the active substance has a low molecular weight. It appears to have a biological effect in cellular defense reactions as in the case of lymphokine in vertebrates.
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