I am trying to see PI3K activation in xenopus oocytes. can any one reccomend a good Ab for doing an IP against PI3K. Upstate Biotech has a Ab against the p85 subunit which they reccomend for the IP for a PI3K assay but the catalytic subunit is the p110. Is the p110 bound to the p85 subunit the active subunit? Any suggestions would be welcome Sid Mitra