Abstract
Toe Erythrina costaricensis transforms the Proechimys chrysaeolus lymphocytes at a concentration of 0.65 lg/ml, the Aotus l. griseimembra lymphocytes at 2.38 lg/ml and human lymphocytes at 19.65 lg/ml. The three species differ in the concentrations required to reach maximal transfonnation; maximum stimulus is obtained with phytohaemaglutinin and favin. The Dioclea lehmanni P2 lectin stimulates only the Aotus l. griseimembra lymphocytes at a concentration of 1.34 lg/ml. Given the structural similarity of favin with the Erythrina lectins, the reported data are puzzling. Sorne hypothesis are laid down to explain the results.
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