2882
There is a cysteine clustering region in an N - terminal region of the c - raf ( - 1 ) product deduced from the nucleotide sequence , and this cysteine clustering region was found to be highly homologous to that present in an N - terminal region of protein kinase C , although , in the latter cysteine clusters are present in duplicate .
 c - raf ( - 1 ) product, protein kinase C
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 c - raf ( - 1 ) product, protein kinase C