4893
For motor activity , alpha 3 null mice demonstrated higher activation by ethanol ( 1 g / kg ) whereas both alpha 2 ( - / - ) and alpha 3 ( - / Y ) knockout mice were less sensitive to ethanol - induced reduction of motor activity ( 1 . 5 g / kg ) .
 Chemical: ethanol; Chemical: ethanol
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: ethanol; Chemical: ethanol