3332
It has been demonstrated that Porphyromonas gingivalis LPS ( P- LPS ) also is able to induce inflammatory cytokines in human gingival fibroblasts .
 human gingival fibroblasts, inflammatory cytokines
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:
 human gingival fibroblasts, inflammatory cytokines