C Cyto B inhibits TNT formation in the co-culture assay. The percentage of cells forming TNTs was quantified in co-cultured cells in the absence or presence of Cyto B. Three independent experiments were conducted. Data information: data were analyzed using two-way ANOVA with Bonferroni post-test and shown as mean ± SEM; * P < 0.05, ** P < 0.01, *** P < 0.001, ns, not significant. 