11779
Unusual two - domain arginine kinases ( AKs ) arose independently at least two times during molecular evolution of phosphagen kinases : AKs from the primitive sea anemone Anthopleurura japonicus and from the clam Pseudocardium sachalinensis .
 two - domain arginine kinases, AKs, phosphagen kinases, AKs
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 two - domain arginine kinases, AKs, phosphagen kinases, AKs