21559
The newly - isolated haloalkane dehalogenase DatA from Agrobacterium tumefaciens C58 ( EC 3 . 8 . 1 . 5 ) possesses a unique halide - stabilizing tyrosine residue , Y109 , in place of the conventional tryptophan .
 haloalkane, halide, tyrosine, tryptophan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 haloalkane, halide, tyrosine, tryptophan