Phenotype profiles of APC isolated from MOPC315 tumors.
(A) APC I cells were triple-stained, and gated class
II+ CD11b+ cells were analyzed for CD11c, CD40,
or CD86 expression, compared with isotype-matched control Abs (dashed
lines). (B) MOPC315 tumors of various sizes were
double-stained, and frequencies of class II+
CD11b+ and class II+ CD11b−
populations were plotted as a function of serum M315 concentration
[categorical (nonlinear) abscissa].