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For the wildtype isoforms , we found that the affinity of MgADP for alpha - S1 ( 100 mu M ) is ~ 4 - fold weaker than for beta - S1 ( 25 mu M ) .
 Chemical: MgADP
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: MgADP