I have a count matrix of gene expression data for several samples, derived from heart tissue (pig). I want to confirm that the gene expression pattern in these samples is consistent with heart tissue.
Is there any database, or other tool, to find genes that are only expressed in this given tissue? Negative markers would be good too, in analogy with the use of positive and negative surface markers in immunohistology. The expected result is to say: "genes x,y are expressed in these samples, therefore the samples are likely derived from heart tissue."
I have checked RefEx database. When I look at heart tissue I get a list of genes, but none of them seems to be specific for heart, or else I am misinterpreting the results.
NOTE: I am aware that databases for pig might not be available, but starting with human and finding homologs is a viable option.