TASK DEFINITION: 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.
PROBLEM: Carnitine biosynthesis. Purification of gamma-butyrobetaine hydroxylase from rat liver.

SOLUTION: gamma-butyrobetaine hydroxylase

PROBLEM: Striatal dopamine, dopamine transporter, and vesicular monoamine transporter in chronic cocaine users.

SOLUTION: vesicular monoamine transporter

PROBLEM: Molecular recognition of histidine tRNA by histidyl-tRNA synthetase from hyperthermophilic archaeon, Aeropyrum pernix K1.

SOLUTION:
histidyl-tRNA synthetase