Immune support also is not mediated by T-cells, since the increased humoral response is accompanied by a decrease in the proliferation of T-cells at doses of vitalethine that increase IgG antibody production. Thus, this seems to be a classical example of a pure, humoral immune or TH-2 type response to immune support withj vitalethine. Since proliferation of immune cells tends to unfold their DNA, making them more susceptible to virus intercalation into the host's genes, this approach may be valuable in fighting off viruses as well. If the immune cells aren't dividing, it is harder for viruses like AIDS to get their genetic material into the host DNA. AIDS patients have only 30% of the normal levels of L-cysteine, until treated with AZT which restores normal levels.