17957
In an effort to uncover new pharmacological targets to prevent amphetamine neurotoxic effects , we have now used a proteomic approach to study protein phosphorylation , in which we combined phosphoprotein enrichment , by immobilized metal affinity chromatography ( IMAC ) , with two - dimensional gel electrophoresis and mass spectrometry , in order to identify the phosphoproteins regulated in the striatum of PTN - / - , MK - / - and wild type ( WT ) mice treated with amphetamine .
 Chemical: amphetamine; Chemical: amphetamine
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: amphetamine; Chemical: amphetamine