18293
Upon the action of the enzyme , the Gd ( III ) complex increases its hydration sphere and takes on a residual positive charge that promotes its binding to endogenous macromolecules .
 Chemical: Gd ( III )
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: Gd ( III )