Instructions: In this task, you are given a sentence. You are expected to recognize the name of gene or protein. Although there might be several correct answers, you need to write one of them.
Input: The dopamine D1 dopamine receptor antagonist SCH 23390 dose dependently ( 7 . 5 - 30 micrograms / kg s . c . ) antagonized the stimulant locomotor effect on both drugs but did not prevent their antiimmobility effect on the behavioral despair test .
Output:
dopamine receptor