Highlights on Cluster 8. A) Tree view representation of Lifind genes, regulated similarly by LIF in r. com. (reversible commitment) and ir. com. (irreversible commitment) conditions and validation of a selection of genes by semi-quantitative RT-PCR, B) Validation of a selection of Lifind genes retrieved by the t-test analysis. §: Samples treated 25 min. with FBS and LIF. Representative results, from 4 independent experiments, are shown.