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Although fluorescence intensities from S K alpha level were much weaker than Ni K alpha signals , we could detect the location of S atoms in recombinant Xcad - 11 proteins .
 Chemical: S; Chemical: Ni; Chemical: S
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: S; Chemical: Ni; Chemical: S