23415
We provide a highly sensitive and selective assay to detect cysteine ( Cys ) and Hg ( 2 + ) in aqueous solutions using Au nanoparticles ( NPs ) stabilized by carboxylethyl quaternized cellulose ( CEQC ) .
 cysteine, Cys, Hg ( 2 + ), Au, carboxylethyl
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 cysteine, Cys, Hg ( 2 + ), Au, carboxylethyl