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### Calcium Signaling and Calcium Sensors: A General Paradigm Many extracellular signals, including light, biotic, and abiotic stress factors, elicit changes in cellular Ca2+ concentration in plants (Trewavas and Knight, 19941; Bush, 19952; Braam et al., 19973; McAinsh et al., 1997[4
Luan et al. (Wed,) studied this question.