A kidney grown in a laboratory has been transplanted into animals. Research in Massachusetts has concluded that simple body parts can grown in labs but was never attempted before since kidneys are very complicated.
The main function of the kidney is to separate urea and other wastes.
The grown kidney is also producing urine. In the journal Nature Medicine showed that engineered kidneys are less effective then natural kidneys.
The researchers vision is to take an old kidney and strip of all cells to leave just the internal structure. The kidney would be rebuilt with cells from patient.