stem,progenitor ,cell,hsc,hematopoietic stem cell,white blood cell,WBC,leukocyte,nk cell,natural killer cell,humoral immunity,adaptive immune system,antibody,antigen presenting cell,APC,bone marrow,peripheral blood mononuclear cell,PBMC,lymphocyte,wbc,cell mediated immunity,CD4,CD8,granulocyte,b cell,memory cell,b lymphocyte,t cell,t lymphocyte,helper t cell,cytotoxic t cell,treg,nk t cell,large granular lymphocyte,LGL,plasma b cell,plasmocyte,plasmacyte,effector b cell,flowchart