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<p>This May 2003 freeze provides estimates of mRNA expression in brains of BXD recombinant inbred mice measured using Affymetrix U74Av2 microarrays. New users are encouraged to use one of the more recent data sets (December 2003 or March 2004). Data were generated at the University of Tennessee Health Science Center (UTHSC). Over 300 brain samples from 33 strains were hybridized in small pools (n=3) to 97 arrays. Data were processed using the Microarray Suite 5 (<a class="fs14" href="www.affymetrix.com/support/technical/whitepapers/sadd_whitepaper.pdf">MAS 5</a>) protocol of Affymetrix. To simplify comparison between transforms, MAS 5 values of each array were adjusted to an average of 8 units and a variance of 2 units. In general, these MAS 5 transforms do not perform as well as RMA, PDNN, or the new heritability weighted transforms (HW1PM).</p>
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