The results in Figure 1 show that there are no major reaction products synthesised prior to the 1 hr time point, at which time the 3ABCD/p110 and 2C/p39 proteins are clearly visible. Extended incubation past the 1 hr point resulted in further proteolytic cleavage of p110 that coincided with the appearance of proteins of the following sizes: 86 kDa, 55 kDa, and 51 kDa. In addition proteins of 29 kDa, 22 kDa and 20 kDa were also visible at the 24 hr time point (Figure 1, lane 7) . The only protein that was consistently visible following the 1 hr time point was the 2C/p39 protein. Despite prolonged incubation there was no indication that the N-terminal/p35 protein was synthesised.