the highest activities of both enzymes were found in freshly isolated chick-embryo tendon and cartilage cells , intermediate activities in confluent cultures of human skin and lung fibroblasts and mouse 3t6 fibroblasts , and the lowest values in three human sarcoma cell lines , the difference in protein disulphide isomerase activity between the freshly isolated tendon cells and confluent simian-virus-40-transformed human lung fibroblasts being about 25-fold .
C0007634
cells
C0016030
fibroblasts