24830
From 15 - 17 June 2011 , a dedicated workhop was held on the subject of in vitro models for mammalian spermatogenesis and their applications in toxicological hazard and risk assessment .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None