Male mouse (left) & (right) transgenic female

Male mouse (left) & (right) transgenic female

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Credit: MEDICAL RESEARCH COUNCIL/SCIENCE PHOTO LIBRARY

Caption: Sex reversal in mice: at right is a chromosomally- female (XX) mouse carrying the Sry-gene (sex- determining region Y gene) that has caused it to grow as a male with testes. At left is a normal male. The mice are products of joint research by the Medical Research Council and the Imperial Cancer Research Fund. A number of embryos were injected with a small fragment of Y chromosome DNA containing the Sry-gene; sex-reversal occurred in some of the females. Sry is believed to act as a switch in the complex gene mechanism that diverts mammalian development from its usual course - the female - to the male.

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Keywords: animal experiment, biological, biology, experimentation, gene, genetics, maleness, mice, mouse, mouse sex, research, science, scientific, sex-determining gene, sry, sry gene, testis-determining gene, transgenic, transgenic mouse

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