These chemical changes are now thought to include gene expression, not just suppression, as had been previously hypothesized.
这些化学变化如今被认为包括基因表达，而不是像过去假设的那样仅仅包括基因抑制。
2
Dr Gardner and his colleagues have found that processing calories affects the activity of BRCA1, a gene that encodes a well-known tumour-suppression protein.