Strain: C57BL6 Thymus, Female total RNA (MoTh.Feml) received from National Human Genome Research Institute was analyzed through Bioanalyzer and passed our quality control test. The mRNA was processed according to the MPSS protocol as outlined in the previous publications (Brenner, S., et al. (2000) Proc Natl Acad Sci U S A 97(4): 1665-1670 and Brenner, S. et al., Nat. Biotechnol 18(6): 630-634). Briefly, the mRNA was reverse transcribed and the cDNA was digested with Dpn II. The 20 bases adjacent to the 3? most Dpn II site was cloned into a Megaclone vector. The resulting library was amplified and loaded onto microbeads. About 1.6 million microbeads were loaded into each flow cell and the signature sequences were determined by a series of enzymatic reactions as outlined in the above publications. The abundance for each signature was converted to transcripts per million (tpm) for the purpose of comparisons between samples. Cells/tissue: Library MoTh.Feml.sig21 Cell type Thymus, Female Source NHGRI RNA isolation LYNX mRNA QC passed cDNA library: Library DpnII restriction - (signature cloning using MmeI) Sequence length 20 bp MPSS: runs MoTh.Feml_sig21.5280W.b-20 12/13/2004 654547 17677 QC Passed MoTh.Feml_sig21.5280F.a-20 12/2/2004 343847 10228 QC Passed MoTh.Feml_sig21.5280F.b-20 12/1/2004 449061 11663 QC Passed MoTh.Feml_sig21.5151F.a-20 9/22/2004 339696 9987 QC Passed MoTh.Feml_sig21.5151W.a-20 9/2/2004 561755 15139 QC Passed Run group: Total Beads successfully sequenced - 2348906 Processed Signatures - 21390