1.   The serotonin transporter is a separate molecule that allows nerve cells to respond to the serotonin surrounding them.

2.   Another fact that supports the findings is that the female hormone estrogen regulates the serotonin transporter, said Cunningham, who was not involved in the study.

3.   Drugs that hamper the serotonin transporter, including Prozac, are effective anti-depressants.

4.   MDMA gets into the brain cell through the serotonin transporter.

5.   So it made sense to study the gene that tells the body how to make the serotonin transporter, to see if some variant might promote mood disorders.

6.   The gene in the new study tells brain cells how to make the serotonin transporter.

7.   These molecules are called serotonin transporters.