Measuring cellular response to drug treatments (Anisomycin, 1 µM, 30′; TNFα, 10 ng/ml, 60′) on A549 and HeLa cells printed on the same chips.

, bias-corrected mean signal intensity (see Methods) for a given condition, with number of spots of that condition on the chip. SE, standard error of mean signal intensity for a given condition. Pval, p-value of difference between condition and control , measured by one-tailed, two-sample T-test.