A wave of epigenetic therapies is offering hope as ways to cure chronic hepatitis B — a lingering liver infection that is caused by the hepatitis B virus (HBV) and affects more than 250 million people around the world. Currently available drugs often fail to eradicate the virus from the body. Gene-editing therapies — which
A needle approaches an egg (purple) during in vitro fertilization, which some clinics offer in combination with a procedure called mitochondrial replacement therapy. Credit: Zephyr/Scientific Photo Library A small number of fertility clinics around the world are offering a controversial treatment: a procedure to provide clients’ embryos with donated mitochondria as a way to increase
