13165
Hemoglobin / gelatin / fibrinogen ( Hb / gel / fib ) nanofibers are fabricated by electrospinning and are characterized for morphology , scaffold composition , functional groups and hydrophilicity .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None