moreover , administration of sp and il-1 beta to human pdl fibroblasts in vitro for 1 to 60 minutes resulted in significant increases in the levels of the intracellular `` '' second messenger '' '' camp , as well as of pge2 , a plasma membrane-associated fatty acid believed to serve as a local regulator of bone cell activity .
C0021753
il-1 beta
C0086418
human