5635
Ostrich FITC - IgY behaved completely differently to horse Ig ' s ; only 1 h after injection it was possible to observe small brightly green scarce vesicles in vascular endothelium of arteries , interstitial kidney capillaries between nephron tubules and were also scarce in glomeruli endothelium ; FITC - IgY appeared only in hepatic sinusoids in the liver .
 FITC, FITC
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 FITC, FITC