Hi Jack and Shirley,

There is another reference that could be worth looking into. This one is
based on RNA-seq transcriptome data, as opposed to microarrays and ESTs.
Here it is:

Ramskold D, Wang ET, Burge CB, Sandberg R (2009)
An Abundance of Ubiquitously Expressed Genes Revealed by Tissue
Transcriptome Sequence Data. PLoS Comput Biol 5(12)

Hope that helps.

- Al.

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