... by injecting healthy cells into their lymph nodes, scientists claim after a successful trial in pigs

• Researchers from University of Pittsburgh gave six pigs serious liver problems  
• They also took liver cells from the animal and implanted into lymph nodes  
• Found these cells grew into complex tissues and worked as a second liver 
• Animals remained healthy despite their primary liver declining because their auxiliary organ took over

Scientists have grown a liver in the lymph nodes of a pig and hope it could allow humans to grow their own replacement organs in future. 

Livers have the ability to naturally regenerate, and a sliver of the filtration organ – if transplanted – can grow to full-size and become fully-functioning. 

It is believed the lymph nodes provide a sanctuary for healthy liver cells, allowing them to slowly multiply and blossom into an 'auxiliary organ'.  

Trials in pigs shows that when the main organ was beleaguered with disease and began failing, the animal remained healthy because the auxiliary organ took over.