9648
The first residue of the single strand RNA segment in the backtracked transcription elongation complex strongly promotes transcript hydrolytic cleavage by establishing a network of interactions that force a shift of stably bound Mg ( 2 + ) to release some of its aspartate coordination valences for binding to the second Mg ( 2 + ) thus enabling catalysis .
 Chemical: Mg ( 2 + ); Chemical: aspartate; 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 + ); Chemical: aspartate; Chemical: Mg ( 2 + )