Natural killer cell cytotoxic activity ( NKCA ) , lymphoproliferative response to the mitogen phytohemaglutinin ( PHA ) , and quantification of the lymphocytes ( CD3 , CD3CD19 , CD56 ) and subpopulations ( CD4 , CD8 , CD56 , CD56 ) as well as cellular expression molecules ( CD25 , CD28 , CD45RA , CD45RO , CD69 , CD95 , HLA-DR ) were determined by immunological assays .
