Sendai virus nuclear protein peptides of different lengths were titrated in peptide vaccination experiments. We observed that peptide length was not important in inducing cytotoxic T lymphocyte-mediated protective immunity in vivo against a challenge with a lethal dose of virus. These results suggest that long peptides are trimmed in vivo to peptides that fit into the groove of major histocompatibility complex class I molecules. In addition several adjuvants were screened for their effectiveness in peptide vaccination protocols. Incomplete Freund's adjuvant and Titermax turned out to be useful, whereas alum was much less effective.
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