Hi All, I have a object "fit": fit<-lmFit(MA,design,ndups=2,spacing=1) fit <- eBayes(fit) And I think use it to make a dendrogram, cluster. A member of the list suggested me read about hclust, plot.hclust and heatmap. I think that heatmap is Ok for me. But, to make a heatmap I need a matrix ('x'). I think that the fit object have this 'x'. I read about MArrayLM-class and see that it have some slots. But I dont know which I use. In resume, I dont know how do I do to obtain values to make a cluster. I attempt to use coef, but I get a error in make heatmap. Someone would can send me a Tip how do I do to begin? Thanks Marcelo