RETRACTION
Volume 76, no. 2, p. 912–917, 2002, 10.1128/JVI.76.2.912-917.2002: It has been called to my (Michael M. C. Lai’s) attention that some lanes of Fig. 1B appear to have used the wrong samples or have been overly manipulated, and I immediately launched an investigation into this matter. Unfortunately, the laboratory no longer has the primary data nor the corresponding lab notes. Although I cannot therefore say with certainty that the data were wrongly manipulated, I have no primary data at hand to validate the published figure. Given these circumstances, and since we cannot perform any additional experiments, I retract this paper.