peripheral blood lymphocyte
英[pəˈrɪfərəl blʌd ˈlɪmfəˌsaɪt]美[pəˈrɪfərəl blʌd ˈlɪmfəˌsaɪt]
Peripheral blood lymphocytes (PBL) are mature lymphocytes that circulate in the blood, rather than localising to organs (such as the spleen or lymph nodes). They comprise T cells, NK cells and B cells.