Glycosylation of k peptide determines the ability to stimulate T-cell proliferation. The k peptide 1T_(179-193) was synthesized in glycosylated (GLYCO P1T) and unglycosylated (P1T) forms and used to stimulate T cells from unimmunized donors 4-6. P < .05 was taken as significant inhibition (t test on log-transformed data).