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Stem cells: International team of researchers creates 132 human-monkey embryos in China | USA

A team of researchers led by the Spanish scientist Juan Carlos Izpisúa has created 132 human-monkey embryos in a laboratory in China, in a controversial experiment first revealed by EL PAÍS in the summer of 2019 and now officially published in detail. Three of the embryos, which grew to contain up to 10,000 cells, developed for 19 days outside the uterus, at which point the researchers interrupted the study, they said in an article published by the scientific journal Cell on April 15. Scientists use the term “chimera” from Greek mythology to refer to these hybrids, in reference to a creature with the head of a lion, a goat’s head on its back and a snake’s head for a tail.

Covid-19 vaccines: What are the risks and benefits for each age group?

All licensed vaccines are extremely effective in preventing severe cases of Covid-19, a disease that has killed around three million people worldwide in the space of one year. However, there are still individuals who are more afraid of the vaccine than of the virus. The focus now is on the Oxford-AstraZeneca and Janssen vaccines, after dozens of those who were vaccinated ­– about 1 in 100,000 – developed a very rare form of potentially lethal blood clots. Below is a sample of risk-versus-benefit calculations. While approximate, they are useful for understanding the kind of figures used by drug regulatory agencies. We start by looking at a general scenario of 100,000 adults of all ages over a period of four months with an incidence of Covid-19 that reflects the rates experienced in 2021 in Spain:

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