Because CD19 is universally expressed on B cells including early B cell precursors, normal recipient B cell will also be a target for the donor NK cells transduced with the anti-CD19 chimeric receptors. Therefore, transient B-cell lymphopenia and hypogammaglobinemia are expected. We will monitor the CD19+ blood cell count and measure the Ig levels once a month and will give the participants intravenous immunoglobulins (IVIG) if their IgG level is lower than age-specific ranges.