FIG. 3.
In situ hybridization with HTLV-1 tax riboprobe on frozen spleen sections from an infected squirrel monkey sacrificed 12 days after inoculation. (A and B) Positive signals in the spleen observed with antisense 33P-labeled riboprobe; arrows indicate positive spleen cells after 10 days of in situ hybridization. (C) Negative control (PBMCs from squirrel monkey not infected with HTLV-1). (D) Positive control (EVO/798 HTLV-1 monkey-transformed cell line).