I am fairly new to bioconductor, so please excuse me if this question is a faq somewhere...) When creating an AffyBatch object from cel files using Data=ReadAffy() I notice that some values are put down as missing. However these seem ok in the cel file. How does the "create-affybatch-object" process decide what should be put down as missing? Thanks, Karin -- Karin Lagesen, PhD student karin.lagesen at medisin.uio.no http://folk.uio.no/karinlag