to the processing unit in the ct module followed by isolation of cartilage 2 the biopsy specimen was cut into small pieces on the sterile workbench treated with enzymes and placed in a c02 incubator followed by isolation of chondrocytes 3 the chondrocytes thus isolated were cultured in a flask containing a culture medium for about one month as a second step media change and subculture were carried out as follows 1 for one month cell culture chondrocytes were allowed to proliferate continuously 2 numbers of chondrocytes proliferated by about 500 fold from initial numbers of 1 u00d7 10 5 cells to more than 5 u00d7 10 7 cells immediately prior to manufacturing cultured chondrocytes 3 during proliferation of chondrocytes media change was carried out to periodically supply nutrients to cells and subculture was carried out to facilitate cell proliferation by changing a culture flask as a third step a manufacturing process of chondrocyte therapeutic was carried out for this purpose test samples collected before and after processes and from final products were subjected to sterility tests in the microbial sterility test unit 30 further except for a sterility test a variety of qc tests such as endotoxin test mycoplasma test using pcr cell count cell viability test virus test cytotoxicity test and identity test were conducted in the quality control unit 40 such processes for producing the cell therapy products were collectively carried out in the ct module 1 after processes.