9650
Transcription factor Gre builds on the ACT mechanism in the same reaction by increasing the retention of the second Mg ( 2 + ) and by activating the attacking water , causing 3000 - 4000 - fold reaction acceleration and strongly reinforcing proofreading .
 Chemical: Mg ( 2 + )
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: Mg ( 2 + )