544
Remarkably , the brain estrogen - synthesizing enzyme , aromatase B , is strongly expressed , particularly in adult fishes , in radial glial cells , which act as progenitors .
 Chemical: estrogen
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: estrogen