8294
Using a rapid , high - throughput polymerization and screening platform with a comprehensive library of 66 monomer - grafted membrane surfaces , the optimal substrate , N - [ 3 - ( dimethylamino ) propyl ] methacrylamide ( DMAPMA ) has been identified to support strong attachment , high expansion capacity , and long - term self - renewal of ES cells ( up to 7 passages ) .
 Chemical: N - [ 3 - ( dimethylamino ) propyl ] methacrylamide; Chemical: DMAPMA
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
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Answer:
 Chemical: N - [ 3 - ( dimethylamino ) propyl ] methacrylamide; Chemical: DMAPMA