i want used COLLAGENASE TYPE IV for isolate SYNOVIAL FIBROBLAST in cartilage.

but the tissue is too small to isolation and i don't detect part of cartilage

so lsolated from rib and cartilage and incubation

but only rib flask has FIBROBLAST like cell exist. not Femoral cartilage.

isolation Can the cells extracted from the ribs that used collagease iv be called synovial fibroblast?