Perhaps murine thymocytes are denied this form of rescue because they shut off IL-2R beta chain expression at an earlier stage or because they may be uncommonly Bcl-2 deficient ( cf . Sentman et al . , 1991 ; Strasser et al . , 1991 ) .
perhaps murine thymocytes are denied this form of rescue because they shut off il-2r beta chain expression at an earlier stage or because they may be uncommonly bcl-2 deficient ( cf . sentman et al . , 1991 ; strasser et al . , 1991 ) .
O B-cell_type I-cell_type O O O O O O O O O O B-protein_subunit I-protein_subunit I-protein_subunit O O O O O O O O O O O B-protein_molecule O O O O O O O O O O O O O O O O O O O