| http://www.w3.org/ns/prov#value | - FIG. 43, Panel A. Increasing Mg2+ in the extracellular fluid from 1 mM to 5 mM did not significantly affect the magnitude of the ATP-induced late prolonged increase in Cai (not shown) suggesting that in contrast to other types of cells, the active ligand for the P2X7 receptor is not the tetra-basic acid ATP4???.
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