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The surviving fraction of confluent cultures of A549 cells where 25 cells were irradiated with 5 carbon ions with or without treatment with lindane (an inhibitor of gap junctional intracellular communication [GJIC]), dimethyl sulfoxide (DMSO) (a solvent of lindane), or 8‐Br‐cAMP (a stimulator of GJIC). The surviving fraction of the non‐irradiated A549 control was normalized as 1.0. The data are plotted with the means and standard errors of more than three independent experiments.
