Researchersre-injectedparticleslate last month, butit was not untilthisweekendthatbunches of protons were once again whizzing around the collider'sentirecircumference.
These particles are injected directly into the target tumour, rather than relying on the leaky walls of tumour capillaries to get them to the right place.
When it is injected into muscle, the AAV particles are sucked up by the hand-like protrusions connecting muscles with the nervous system, all the way back up into the spinal cord.