The amino acid sequences of two lectins from the seeds of Canavalia li
neata and C. virosa have been determined by the manual Edman degradati
on method. Both proteins were found to be highly homologous to concana
valin A, a lectin from C. ensiformis. All the residues suggested to pa
rticipate in binding to carbohydrates and metal ions are completely co
nserved in the proteins.