13758
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 .
 mutant T cell line, SH2 domain-containing leukocyte protein, SLP-76, PTK substrate, hematopoietically expressed adaptor protein
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 mutant T cell line, SH2 domain-containing leukocyte protein, SLP-76, PTK substrate, hematopoietically expressed adaptor protein