ptdinsp2 , the highest labelled polyphosphoinositide , showed a specific activity of 64,000 dpm/nmol per g muscle wet wt. , suggesting that high specific activity atp may be compartmentalized in the local environment of the triads and used as a substrate by the ptdins and ptinsp kinase in that region .
C0071655
polyphosphoinositide
C0031621
ptdins