since mast cells have previously been shown to be potent modulators of lymphocyte function , the effect of varying concentrations of three mast cell- or basophil- as well as skin ground substance-derived glycosaminoglycans ( gag ; heparin , chondroitin sulfate , hyaluronic acid ) and of histamine was investigated on rat spleen cell 3h-thymidine incorporation in the absence and presence of mitogens .
C0017973
glycosaminoglycans
C0019134
heparin