72242
The polymerization of cyclopentene by Ziegler-Natta catalysts yields 1,3 - linkages , not the more typical 1,2 - linked polymer .
 Ziegler-Natta
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ziegler-Natta