16576
Atactic and heterotactic microstructures in the PLA block resulted in lower micellar stability , as well as faster degradation and shorter erosion time compared to polymers with high isotactic enchainment ( Pm ) .
 Chemical: PLA
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: PLA