A mutant T cell line was isolated that lacked expression of SLP-76 ( SH2 domain-containing leukocyte protein of 76 kilodaltons ) , a hematopoietically expressed adaptor protein and PTK substrate .
a mutant t cell line was isolated that lacked expression of slp-76 ( sh2 domain-containing leukocyte protein of 76 kilodaltons ) , a hematopoietically expressed adaptor protein and ptk substrate .
O B-cell_line I-cell_line I-cell_line I-cell_line O O O O O O B-protein_molecule O B-protein_molecule I-protein_molecule I-protein_molecule I-protein_molecule O O O O O O B-protein_molecule I-protein_molecule I-protein_molecule I-protein_molecule O B-protein_molecule I-protein_molecule O