almost all precursor cells capable of forming clones when stimulated with concanavalin a in the presence of irradiated spleen cells and growth factors , and almost all precursors of those clones that were cytolytic in a lectin-mediated tumor-cell-lysis assay , were within this 2 % subpopulation of nu/nu spleen cells with mature t-cell markers .
C0018956
precursor
C0007634
cells