21172
Structural Units Important for Activity of a Novel - type Phosphoserine Phosphatase from Hydrogenobacter thermophilus TK - 6 Revealed by Crystal Structure Analysis .
 Chemical: Phosphoserine
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: Phosphoserine 
Answer:
 Chemical: Phosphoserine