13410
Expression and enzyme activity of CYP27B1 / 1 alpha - hydroxylase are upregulated by substrate 25 ( OH ) D and Parathyroid Hormone ( PTH ) and are downregulated by 1 alpha , 25 ( OH ) ( 2 ) D .
 Chemical: 25 ( OH ) D; Chemical: 1 alpha , 25 ( OH ) ( 2 ) D
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: 25 ( OH ) D; Chemical: 1 alpha , 25 ( OH ) ( 2 ) D