22002
Closure of the backdoor stabilizes two mobile regions , switch I and switch II , to generate the phosphate tube from which hydrolyzed phosphate is released .
 Chemical: phosphate; Chemical: phosphate
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: phosphate; Chemical: phosphate