Figure 2.

Exosomes isolated from RR cell lines increased the survival of recipient cells. Analysis of (A) cell viability and (B) colony-forming ability were assayed after (i) REM134, (ii) REM134 RR, (iii) MDA-MB-231 and (iv) MDA-MB-231 RR cells were treated with the indicated dose of exosomes isolated from either corresponding non-RR or RR cells. All results are relative to the appropriate PBS control. Three repeats were performed and analysed by a two-sample t test. Error bars indicate ±SD. * p ≤ 0.05, ** p ≤ 0.01; *** p ≤ 0.001, **** p ≤ 0.00001.