이러한 연골세포가 처음 만들어진 건 2004년으로 알려졌으나, 치료제엔 해당 연골세포가 아닌 허가받지 않은 다른 세포(GP2-293세포)가 사용됐다.
It was known that these cartilage cells were first created in 2004, but other unauthorized cells (GP2-293 cells), not the corresponding cartilage cells, were used in the treatment.