17232
After CUI - 3IIb - 3 - 2 digestion by endo - alpha - d - ( 1 --> 4 ) - polygalacturonase , its hydrolysate was fractionated into PG - 1 and PG - 2 .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None