Expression profiles of miRNAs in skin fibroblasts. (a) A cluster of 33 miRNAs induced during early proliferation but repressed in asynchronously growing cells and late during proliferation. 10% serum was used in all these stimulation treatments except for one FGF (100 ng/ml) treatment as indicated. The colors representing ratios from the dye-swap experiments were inverted to be consistent with the non-dye swap samples. (b) Averaged expression level for each condition in the above clustering image.