Hello Dear BioC-community, We are trying to check a non-lineal mapping between the expressions of two sets of the same genes under different conditions. I am afraid that we have a basic knowledge about Bioconductor capacities... We have tried to use the ALL database, but after filtering expressions we obtain that almost all genes, associated with two different class of cancer cell types, seem to have similar behavior as we can glance at it with a Multidimensional Scaling map. In fact, our interest is mainly to check a non-standard non-linear Bayesian statistical procedure, and for that there is not any library in the Bioconductor repository (nowadays). We wonder whether it exists any database with same genes but with a strongly different behavior under different conditions. As a first application we considered cancer related data but we do not know if it may be better to look for databases with same type of genes but from different species. Best jm~ _______________________________ J. Miguel Marin http://www.est.uc3m.es/jmmarin Dep. of Statistics University Carlos III of Madrid Spain (E.U.)