For the first time, scientists in Japan have cloned a mouse using just a drop of blood taken from its tail. The result is important because it gives scientists a new way to preserve strains of lab mice for the study of human diseases. The female clone proved to be fertile by natural mating and lived for 23 months, which is about normal for a lab mouse, researchers from RIKEN BioResource Center in Tsukuba, Japan, report in a paper published online in the journal Biology of Reproduction on 26 June...
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