wade

ALL nucleated cells present MHC class I. 1) B cells and macrophages nucleated, correct? therefore they should have MHC I and MHC II (since they are antigen presenting cells too) If not, why is it the NK cells don't kill them due to lack of MHC I? 2) Why don't NK cells kill our red blood cells since they are non nucleated? 3) What is the most abudant type of lymphocyte in the blood of a healthy individual? I am an undergraduate student with hope of getting into medical school. These are NOT homework questions but rather just me trying to understand what I am missing here on the first 2 questions, along with the true answer for number 3. Thanks so much!