15045
We identified a regulatory mechanism of FGFR signaling involving phosphorylation of Ser ( 777 ) in the C - terminal region of FGFR1 by the MAPKs extracellular signal - regulated kinase 1 ( ERK1 ) and ERK2 .
 Chemical: Ser; Chemical: C
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; Chemical: C