IL15 and B-cell chronic lymphocytic leukemia: Parenthetically, it warrants noting that the majority of viability-gated, undivided cells in these activated cultures are not quiescent; rather, they characteristically manifest some size enlargement, as measured by increased forward light scatter upon flow cytometry (or visibly increased size by phase microscopy) over CLL cells cultured in medium or IL15 alone (data not shown; [2,34,35]).