Fig. 1. Cells of contention: An early human embryo, which can provide a source of stem cells, fits easily on the tip of a needle. But the problems raised by such a potential are far from microscopic.
Yorgos Nikas, Science Photo Library.
(Stem cells fuel bitter ethical divisions, Current Biology (2001) 11(15):R581-5827)

Fig. 1. Cells of contention: An early human embryo, which can provide a source of stem cells, fits easily on the tip of a needle. But the problems raised by such a potential are far from microscopic.

Yorgos Nikas, Science Photo Library.

(Stem cells fuel bitter ethical divisionsCurrent Biology (2001) 11(15):R581-5827)

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    Fig. 1. Cells of contention: An early human embryo, which can provide a source of stem cells, fits easily on the tip of...