S where phenotyped on MS medium containing 0 and 3 (w/v) Suc and soil (peat/perlite/vermiculite) according to the parameters described previously (Boyes et al., 2001). Seeds were sterilized with chlorine gas and sown on MS medium containing 3 (w/v) Suc followed by 48 h of stratification at 4 . Plants were grown for 2 weeks at 22 with a light intensity of 80 mmol quanta m22 s21 in a 16-h photop
Phosphatase activity of PP2A in studies involving a second known binding partner of tAg, the JCV agnoprotein [40]. We were surprised to identify two LxCxE motifs that had been overlooked in the unique region of the JCV tAg; one of these sites is also found in BKV but neither site resides in the corresponding SV40, WUV, KIV or MCV polyomavirus proteins. As predicted, JCV tAg binds members of the re