20246
We demonstrate that the formation of a supported lipid membrane can be quantitatively monitored from the characteristic fluorescence of ( 157 ) Gd ( 3 + ) ions bound to the headgroup of chelator lipids .
 Chemical: ( 157 ) Gd ( 3 + )
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: ( 157 ) Gd ( 3 + )