HTLV-1-specific antibody response by Western blot. Data represents 1:2000 dilutions of week-8 postinoculation plasma. R11, R12, R13, and R14 were inoculated with ACH.75. R1, R2, R16, and R17 were inoculated with ACH.95. R18, R19, R20, and R21 were inoculated with ACH.195. R5, R10, and R22 were inoculated with ACH.1. R9 was inoculated with uninfected PBMCs as a negative control. ^*Serum control band; ^**cellular antigen; ‡HTLV-2 SU band.