Fig. 7. The intracellular Ca²⁺ concentration in isolated host cells (N=30) from Aiptasia puchella and the Ca²⁺ concentration of a buffer containing 150 µmol l^-1 Ca²⁺ obtained by Ca²⁺ imaging using the dye Fura-2AM during temperature stress. The cells were subjected to a temperature stress from 20.4 to 36° C and back to 22°C, while the buffer was subjected to a temperature change from 21.6 to 36.5°C and back to 22°C.