Apple has been (almost) always using Intel chips for anything other than iPads and iPhones. It is possible though that at some point they will leave Intel and invest in their own processing technologies.
A study in particular tried to find out whether miRNAs play a role in those defects with stem cell transplants. miRNAs, are small RNA molecules that affect the genome but do not code for any proteins. It has been shown, that such small pieces of RNA can be used as signals in the cell and they can be expressed under varying stimuli.
Cellular ageing has been shown to lead to age related pathologies.