Isolation of the receptor for Amaranthus leucocarpus lectin from murine naive thymocytes

terminal amino acid residues are blocked both in the receptor and its purified isoforms. Analyses of the receptor’s peptides, obtained by trypsin digestion with MALDI-TOF (matrix assisted laser desorption ionizationtime of flight), were compared with the relative values obtained from the NCBInr (Swiss-Prot 10/01/99) database. Our results indicate that the peptides of ALLTr show low homology (<17%) with the human KIIA protein, the Fasassociated death domain protein, and the transforming growth factor-β type II receptor. Our results suggest that the ALL thymocyte receptor could be considered a novel phenotypic marker specific for naive T cells.