we examined the effects of calcium ( ca2+ ) , magnesium ( mg2+ ) , and fluoride ion ( f- ) on inositol phosphate accumulation in bovine parathyroid cells prelabeled with [ 3h ] inositol to determine whether these agents might modulate cytosolic ca2+ through accumulation of intracellular inositol 1,3,4,5-tetrakisphosphate ( ip4 ) , which has been postulated to be a mediator of the influx of extracellular ca2+ .
C0021554
inositol phosphate
C0021547
inositol