421
An implant may release a drug either by diffusion concurrent with dissolution of the polymeric implant material without depolymerization ( Type A ) or by bioerosion involving depolymerization ( Type B ) .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 None