For example, in the well known Bess and co-authors 1997 Virology paper, the authors had 3 HUT-78 cultures, two infected and one uninfected control. (The HUT human cell line is that used by Gallo to "isolate" HIV in 1984 and since). The proteins from the banded material from all cultures including the control (lane A), which they called "mock virus", were compared using electrophoresis. They stated that the only difference between the 3 strips was that the infected strips contained major bands of p24, p17 and p6/7 and called them HIV proteins. But these same bands, although weaker, can also be seen in the "mock" virus protein strip whereas, to be HIV proteins, requires them to be present exclusively in the "infected" strips. When asked for proof that p24 etc in the strips B and C were HIV proteins their answer was that the labels were added for the reader’s convenience at the suggestion of the reviewers.

So Bess and his colleagues have shown that the same proteins are present in the pure HIV and "mock" virus. (Virol. 230:134-144)