Janet Finch Saunders AM noted the decline in GCSE take up of STEM subjects and the fact that take up at A level has not increased in line with overall A level entries as she called on the government to introduce a programme encouraging highly talented people into STEM subject teaching.

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Feinerman said his expertise comes from extensive reading on the subject, and attending international conferences on stem cell research, sometimes as many as six a year.

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The danger in Obama's words is that they did not stem from a political position that is subject to change according to state interests.

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Eggan's technique, which is the subject of a paper in the current issue of Nature, creates stem cells specific to a particular disease, like cancer or diabetes, without a supply of human egg cells.

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