21172
Structural Units Important for Activity of a Novel - type Phosphoserine Phosphatase from Hydrogenobacter thermophilus TK - 6 Revealed by Crystal Structure Analysis .
 Chemical: Phosphoserine
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: Phosphoserine