11589
The results indicate that HAS1 is almost inactive in cells with low UDP - sugar supply , HAS2 activity increases with UDP - sugars , and HAS3 produces hyaluronan at high speed even with minimum substrate content .
 UDP, sugar, UDP, sugars
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 UDP, sugar, UDP, sugars