Semiquantitative analysis of HTLV-1 SU- and TM-specific antibody responses. Densitometry analysis was performed on the Western blots shown in Figure 3. (A) SU average pixel density. The ACH.195 SU average pixel density was lower than that seen in other inoculation groups. (B) TM average pixel density. The ACH.195 TM average pixel density was similar to that seen in other inoculation groups. (C) SU average pixel density/TM average pixel density. ACH.195 rabbits mounted a lower SU antibody response relative to their TM antibody response compared with rabbits in other inoculation groups.