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The importance of cortical or hippocampal neurons as a source or a sink of adenosine under basal and hypoxic / ischemic conditions was addressed through the use of transgenic mice expressing human equilibrative nucleoside transporter 1 ( hENT1 ) under the control of a promoter for neuron - specific enolase .
 Chemical: adenosine; Chemical: nucleoside
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: adenosine; Chemical: nucleoside