22445
Insulin - resistant vascular smooth muscle cells displayed hyperphosphorylation of insulin receptor substrate - 1 at Ser residues 636 / 639 , which decreased the activity of insulin receptor substrate - 1 .
 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: Ser