A humster is a hybrid cell line made from a zona-free hamster oocyte fertilized with human sperm.
[1] It always consists of single cells, and cannot form a multi-cellular being.
Humsters are usually destroyed before they divide into two cells; if isolated and left alone to divide, they would still be unviable.
[2] Humsters are routinely created mainly for two reasons: Somatic cell hybrids between humans and hamsters or mice have been used for the mapping of various traits since at least the 1970s.
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