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The pp90rsk - protein kinase activity ( referred to as rsk - kinase ) is also not related to cofactor - dependent signal transducing protein kinases such as the cyclic AMP - dependent protein kinases , members of the protein kinase C family , or other Ca2 ( + ) - dependent protein kinases .
 pp90rsk - protein kinase, rsk - kinase, cyclic AMP - dependent protein kinases, protein kinase C family, Ca2 ( + ) - dependent protein kinases
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 pp90rsk - protein kinase, rsk - kinase, cyclic AMP - dependent protein kinases, protein kinase C family, Ca2 ( + ) - dependent protein kinases