The analysis revealed that several functions were associated with more or fewer genes in cancer cells than in healthy cells, but not because of changes in the expression of these genes. (sciencedaily.com)
While some genes important to cancer development have clear alterations in their genetic codes to explain changes in their expression in cells, some do not exhibit such defined defects. (www2.vet.cornell.edu)
The brain attempts to adapt and respond to those challenges and that occurs in large part through changes in expression of brain genes through epigenetic mechanisms. (scientificamerican.com)