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.

The propeptides of VEGF-D determine heparin binding, receptor heterodimerization, and effects on tumor biology.
VEGF-D

Use of (Gyro) Gy and spermine synthase transgenic mice to study functions of spermine.
spermine synthase

Electrophysiological properties of mouse horizontal cell GABAA receptors.

GABAA