From around the mid 1990s, researchers discovered that is... governed... by the mitochondria. ...[T]he failure to commit apoptosis is the root cause of cancer. ...In cancer, individual cells bid for freedom ...Without , the bonds that bind cells in complex s might never have ebvolved.

[T]he '' contends that ageing and many of... [its associated] diseases... are caused by... free radicals leaking from mitochondria during normal . ...As they burn up food using oxygen, the free-radical sparks escape to damage adjacent structures ...Many cruel inherited conditions... are linked with mutations caused by free radicals attacking mitochondrial genes.