21179
We anticipate that our present findings will facilitate understanding of the serine biosynthesis pathways of organisms that lack gene ( s ) encoding conventional PSPs , as the structural information revealed here will help to identify iPSP from sequence databases .
 Chemical: serine
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: serine