Users sign up and receive a DNA testing kit in the mail, spit into a cup, and send the kit back to be tested for mutations in a serotonin transporter gene and a group of three genes that belong to the human leukocyte antigens (HLA) system.“Theoretically, selection of the serotonin transporter gene does make a little sense,” said geneticist Ricki Lewis, Ph.
Others are based on pure physical attraction and a quick swipe to the left or right.
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