4420
Constitutively active MAPKK-1 fully activates ERK-2 and the transcription factor Elk-1 , but does not substitute for activated p21ras and synergize with calcium /calcineurin signals to induce NFAT .
 MAPKK-1, transcription factor, NFAT, Elk-1, p21ras, ERK-2, /calcineurin
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:
 MAPKK-1, transcription factor, NFAT, Elk-1, p21ras, ERK-2, /calcineurin