5448
DA function was studied at several levels : i ) at a presynaptic level where neuroimaging studies investigating DOPA uptake capacity clearly show an increase of DA synthesis in patients with schizophrenia ; ii ) at a synaptic level where neuroimaging studies investigating dopamine transporter availability ( DAT ) does not bring any evidence of dysfunction ; iii ) and finally , neuroimaging studies investigating DA receptor density show a mild increase of D2 receptor density in basic condition and , an hyperreactivity of DA system in dynamic condition .
 Chemical: DOPA; Chemical: dopamine
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: DOPA; Chemical: dopamine