4661
Furthermore , AR phosphorylation at Ser - 578 by PAK6 promotes AR - E3 ligase murine double minute - 2 ( Mdm2 ) association , causing AR degradation upon androgen stimuli .
 Chemical: Ser; Chemical: androgen
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: Ser; Chemical: androgen