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.

[EX Q]: The 5 - HT3 antagonist ondansetron reduced alcohol intake in both the medium and high alcohol preferring rats at doses between 0 . 01 and 0 . 16 mg / kg .
[EX A]: 5 - HT3

[EX Q]: The coding region of nifA was determined using a translational lacZ fusion and by site - directed mutagenesis to identify which of four in frame AUG codons was used .
[EX A]: lacZ fusion

[EX Q]: Further , cells cotransfected with a UF promoter - luciferase ( - 1935UF - Luc ) reporter gene and the BTEB expression vector had 2 - fold higher Luc activity than those cotransfected with reporter gene and pcDNA - 3 .
[EX A]:
UF promoter