Effect of different dilutions of ABRM and of apoptotic bodies derived from HL-60 cells on proliferation of EPCs. (A) Line graph depicts the proliferation rate of EPCs after treatment with different dilutions of ABRM. The protein content of the undiluted ABRM (1:1) was approximately 16 μg/mL. Incubation with endothelial basal medium, which was used to obtain and to dilute the ABRM, is shown as a control (CON). Proliferation rate is expressed as the percentage of control (= 100%; mean ± SD, n = 3-7, ^**P = .04, ^*P = .01). (B) Bar graph represents the proliferation rate of EPCs after a parallel incubation with ABRM (▦) or apoptotic bodies-rich supernatant from HL-60 cells (apo HL-60, ▨). Proliferation rate is expressed as the percentage of control (= 100%, □). Mean ± SD, n = 5-9.