Lcells, she says.
17 A few years later Evans and his colleagues showed that they could
produce live mice by injecting cultured ES cells into a developing
50 embryo. The result is a chimera, an animal whose tissues are a mix of
T
the ES cells and those from the host embryo. In many of those chimeras,
the added ES cells by chance produce the animal's sperm or eggs, and
when these chimeras mate, some of their offspring carry the stem cells'
genes in all their tissues.