Effect of blood components on MLR response. The behavior of MLR performed in absence (▪) or presence of PLT (▴, A), RBC-30 (▴, B), RBC-5 (▴, C), LD-RBC (•, D), and FFP (⧫, D) is shown. The behavior of MLR performed in presence of PLT, RBC-30, and RBC-5 immunodepleted of sHLA-I (▿), sFasL (▵), or sHLA-I and Fas-L (○) is also shown (A, B, C, respectively).