21309
Here we used organotypic spinal cord slice cultures from 3 weeks - old mice to evaluate the mechanisms of neuroprotection by progesterone and its 5 alpha - reduced metabolites .
 Chemical: progesterone
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: progesterone