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Antibody responses of monkeys against HTLV-1, tested by ELISA after inoculation with homologous HTLV-1 monkey-transformed cell lines. Monkey 90083 was sacrificed at 35 days, monkey 92106 was sacrificed at 3 months, monkey 92039 was sacrificed at 6 months, and monkey 1657 was sacrificed at 26 months. O.D., optical density.
