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We report here that PLC-γ isoforms are required for agonist-induced Ca 2+ entry (ACE). Overexpressed wild-type PLC-γ1 or a lipase-inactive mutant PLC-γ1 each augmented ACE in PC12 cells, while a deletion mutant lacking the region containing the SH3 domain of PLC-γ1 was ineffective. RNA interference to deplete either PLC-γ1 or PLC-γ2 in PC12 and A7r5 cells inhibited ACE. In DT40 B lymphocytes...