Hi everyone. What is the best way to reproduce MAS 5.0 outcome for each probe pare intensity value using BioConductor? I tried bg.correct.mas() function alone, but it did not seem to work for me, although resulting P value of a probe set is kind of close the absolute call is way off. Any suggestions? Thank you very much Dmitry N. Grigoryev, M.D., Ph.D. Data Analyst Gene Expression Profiling Core Division of Pulmonary and Critical Care Medicine Johns Hopkins University School of Medicine