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- _4 wasQuotedFrom 12145276 provenance.
- _4 value "We found that caffeine inhibits the in vitro lipid kinase of class I PI3Ks (IC(50) = 75 microm for p110 delta, 400 microm for p110 alpha and p110 beta, and 1 mm for p110 gamma), and theophylline has similar effects (IC(50) = 75 microm for p110 delta, 300 microm for p110 alpha, and 800 microm for p110 beta and p110 gamma) and also inhibits the alpha isoform of class II PI3K (PI3K-C2 alpha) (IC(50) approximately 400 microm). Surprisingly the triazoloquinazoline CGS15943 (9-chloro-2-(2-furyl)(1,2,d)triazolo(1,5-c)quinazolin-5-amine) also selectively inhibits p110 delta (IC(50) < 10 microm)." provenance.