22157
In this study , we investigated the effects of astaxanthin on transforming growth factor beta 1 - mediated and bleomycin - induced pulmonary fibrosis in vitro and in vivo .
 astaxanthin, bleomycin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 astaxanthin, bleomycin