13408
Human MSCs express the vitamin D receptor , 25 - hydroxylases , 1 alpha - hydroxylase , and 24 - hydroxylase ; stimulation of in vitro osteoblastogenesis by 25 ( OH ) D depends on the activity of CYP27B1 / 1 alpha - hydroxylase .
 Chemical: vitamin D; Chemical: 25 ( OH ) 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: vitamin D; Chemical: 25 ( OH ) D