instruction:
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.
question:
Inhibition by pentosan polysulfate (PPS) of heparin-binding growth factors released from tumor cells and blockage by PPS of tumor growth in animals.
answer:
heparin-binding growth factors

question:
Evidence that an alpha 2A-adrenoceptor subtype mediates antinociception in mice.
answer:
alpha 2A-adrenoceptor

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