Citazione:

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The only cell-type or tissue expression information BioMart can return
is from two consortia: eGenetics/SANBI, a library of ESTs, and also the
GNF expression data set, based on a microarray. Here is some 'help' and
more information:

* eGenetics/SANBI EST Expression Data - Libraries of ESTs deposited
in dbEST, were annotated with eVOC terms by SANBI, and then mapped to
Ensembl gene predictions via a mapping of ESTs to Ensembl transcript
predictions.

The reference is here:
http://mips.gsf.de/staff/mader/microa/bibliography/entry-Kelso03.html

* Genomics Institute of the Novartis Research Foundation (GNF) -
This expression data set is based on the Affymetrix HG-U95A microarray,
was annotated with eVOC terms by SANBI and then mapped to Ensembl gene
predictions via a mapping of Affymetrix probe sequences to Ensembl
trancript predictions.

http://symatlas.gnf.org/SymAtlas/

In BioMart, if you look under 'Filters: EXPRESSION' and click 'Browse'
next to different terms, it will show a list of possible terms to enter.
Fo example, click on 'eGenetics/SANBI' EST cell type data (browse).
Choose 'T-lymphoblast' or 'T-lymphocyte'. There should be 4,632 human
genes that are associated to 'T-lymphocyte' (I saw this clicking on
'count'.)

Otherwise, we don't have this sort of information. It's true it is not
described in the help- we are thinking of improving the help to be
term-specific so that a word or term could be clicked upon and an
explanation given. However, for BioMart this is tricky as the
programmers don't always know what the orginal data is about, they just
organise it into BioMart. Most of what our users use BioMart for is
found in Ensembl help pages, but for the expression data, it is not in
the Ensembl browser.

I hope this helps.

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