transcriptional profiling on all open reading frames of saccharomyces cerevisiae open reading frames 6116 of the budding yeast saccharomyces cerevisiae were pcramplified from genomic dna using 12232 primers specific to the ends of the coding sequences the success rate of amplification was 97 pcrproducts were made accessible to hybridization by being arrayed at very high density on solid support media using various robotic devices probes made from total rna preparations were hybridized for the analysis of the transcriptional activity of yeast under various growth conditions and of different strains experimental factors that proved critical to the performance such as different rna isolation procedures and the assessment of hybridization results for example were investigated in detail various software tools were developed that permit convenient handling and sound analysis of the large data quantities obtained from transcriptional profiling studies comprehensive arrays are being distributed within the european yeast functional analysis network eurofan and beyond