a set of t cells defined by a unique profile of cell surface alloantigens ( phenotype ly-1+2- ; qa-1+ ; i-j+ ) produces biologically active cell-free material ( s ) ( ly-1 tsif ) which induces another t cell set ( cell surface phenotype ly-1,2+ ; i-j/ ; qa-1+ ) to participate in the suppression of primary immune responses to heterologous erythrocytes .
C0007634
set of
C0699040
of cell surface