Hi I'm using the hclust function from mva R v 1.8 I've plotted a dendrogram with genenames e.g. plot(hclustoutput, labels=genenames etc) I'm currently using the identify.hclust command: ClusterID <- identify(hclustoutplut, MAXCLUSTER=60) which returns something like: 375 376 377 378 379 380 2.7004349 381 1.8060133 1.1440009 382 0.7630247 3.1794324 2.1269562 383 0.4950094 2.4738040 1.4827588 0.7810937 384 0.9291393 2.2186614 1.1459034 1.0344517 0.6617410 385 1.4570777 2.5765989 1.7992481 1.6056936 1.5644727 1.1153774 386 0.3695838 2.8249040 1.8551363 0.5220643 0.5924702 0.8052963 1.2503008 for each cluster specified. My question is can I specify the genenames that I used in the original plot and return them for each of the clusters I choose rather than the information that is returned by default. many thanks Jason -- -------------------------------- Jason Skelton Pathogen Microarrays Wellcome Trust Sanger Institute Hinxton Cambridge CB10 1SA Tel +44(0)1223 834244 Ext 7123 Fax +44(0)1223 494919