17142
The C - terminal extended serine residue is absolutely required in nosiheptide maturation .
 Chemical: C; Chemical: serine; Chemical: nosiheptide
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: C; Chemical: serine; Chemical: nosiheptide