MTT‐viability tests on SH‐SY5Y exposed to H/R injury treated with a non‐selective GJIC inhibitor (CBX), selective inhibitor of homotypic Cx43‐GJs (IO) and, selective inhibitor of homotypic Cx43‐HCs (GAP19). MTT‐viability tests performed at 0, 3, 8 and 24 hrs. Values of spectrophotometric determination at 550 nm are reported as percentage of cultures at time 0, considered as 100%. Data are shown via standard box‐and‐whiskers plots in which the central‐line represents the median, the upper and lower bounds of the box are min and max value and dots represent all value. NS not significant, *P < 0.05 and ***P < 0.001 versus CTRL Normoxia time 0. #P < 0.05. (manovas and Tukey honest significant difference (HSD) post hoc test).