the possibility that a single human tumor may be composed of an heterogeneous population of cells with respect to susceptibility to lysis by autologous ctl clones was investigated by testing six cytolytic clones derived by micromanipulation against the autologous metastatic melanoma , me28 , and against 31 clones derived from me28 by cloning in soft agar .
C0007634
cells
C1536403
cytolytic