Subsequent gene identification through GeneCards (https://www.genecards.org/), DisGeNET (https://www.disgenet.org/), and Diseases (http://diseases.jensenlab.org/) databases revealed 21 common genes (search term: “postpartum depression”), including BDNF, as pivotal (Fig. S1A). The gene discussed is BDNF; the disease is postpartum depression.