12597
Findings that xenogeneic serum promotes leukocyte-endothelium interaction possibly through NF-kappa B activation might be relevant for designing future therapeutic strategies aimed at prolonging xenograft survival .
 NF-kappa B
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:
 NF-kappa B