4663
Moreover , we found that Thr - 158 collaborates with Ser - 186 for AR - Mdm2 association and AR ubiquitin - mediated degradation as it facilitates PAK6 - mediated AR homeostasis .
 Chemical: Thr; Chemical: Ser
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: Thr; Chemical: Ser