Detection of HIV-1 p55 by Western blotting using the anti-p55 antibody Lane1: Extract of MT4 cells Lane2: Extract of MT4 cells infected with HIV-1 (LAI strain) This antibody reacts with not only p55 but also the processed products p24 and p17. The other bands are intermediates of processing. The antiserum was diluted 2,000 fold before use.