22158
The results showed that astaxanthin significantly improved the structure of the alveoli and alleviated collagen deposition in vivo .
 Chemical: astaxanthin
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: astaxanthin 
Answer:
 Chemical: astaxanthin