Chanel Torres loves her small dog but wanted another pet, a monkey. "I was so excited to have one," Chanel said. She and her mom went online and found an advertisement for marmosets for $300 each.

Apparently unique among mammals, marmosets routinely produce dizygotic twins that exchange hematopoietic stem cells in utero, a process that leads to lifelong chimerism 1,2. As a result of this ...

The researchers were donated unused marmoset ovaries from some Japanese research institute, which were xenotransplanted into the mice renal capsules. After transplantation, the marmoset oocytes were ...