QT clustering revealed sets of genes differentially expressed between serum and serum-freeB4L EB culture. QT clustering revealed nine sets of genes with similar dynamic expression profiles (Pearson Correlation coefficient of > 0.9). In sets 1–7, expression is higher in serum (black sets). In sets 8–9, expression is greater in serum-freeB4L EB culture (red sets). Some sets have been named based on the similarity of overall gene function during differentiation pathways (see Table 3).