13556
In addition , bioinformatics analysis showed AFE _ 1073 was a typical transmembrane protein P1b1 - ATPase , which could reduce the harm of Cu ( + ) by pumping it out from the cell .
 Cu ( + )
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Cu ( + )