9381
The chemioselectivity also appeared to be different with major modifications taking place on histidine , methionine , and cysteine residues in RHE , while on HSA , significant modifications were observed on lysine residues with the formation of methylated and dimethylated amino groups .
 histidine, methionine, cysteine, lysine, amino
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 histidine, methionine, cysteine, lysine, amino