28920
Proteoglycans ( PGs ) modulate numerous signaling pathways during development through binding of their glycosaminoglycan ( GAG ) side chains to various signaling molecules , including fibroblast growth factors ( FGFs ) .
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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:  
Answer:
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