12374
The active site of ALDH16 proteins from bacterial , frog and lower animals contain the catalytically important cysteine residue ( Cys - 302 ) ; this residue is absent from the mammalian and fish orthologs .
 Chemical: cysteine; Chemical: Cys
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: cysteine; Chemical: Cys