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Linky
The heartbeat is controlled by electrical signals and if these go awry the consequences can be fatal.
Scientists injected a genetically-modified virus into guinea pigs to turn part of their heart into a new, working pacemaker.
They used a virus to infect heart muscle cells with a gene, called Tbx18, which is normally active when pacemaker cells are formed during normal development in an embryo.
When heart cells were infected with the virus they became smaller, thin and tapered as they acquired the "distinctive features of pacemaker cells", the report said.
When the virus was injected into a region of the hearts of seven guinea pigs, five later had heartbeats which originated from their new pacemaker.
This is pretty awesome. Thoughts?