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The groundbreaking
involved injecting 25 human cells into the
of long-tailed macaque monkeys. The human cells developed inside 132 of the embryos. The scientists studied the
of the embryos for 19 days. Many people are
by the research and believe it belongs to the
of horror movies. Professor Greely said he appreciated that there are many
concerns around the creation and use of chimera. He said: "Every time a person gets an
transplant, the result is an intra-species chimera - an organism made up of cells from two
of the same species....When a human gets a pig heart
, she becomes an inter-
chimera."
