25409
The mean AChE concentration in the OP - exposed group was determined as 33 . 79 +/- 6 . 84 U / g haemoglobin ( Hb ) for PON1 192 R ( + ) carriers and 30 . 37 +/- 7 . 62 U / g Hb for PON1 192 R ( + ) carriers .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None