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Male mouse (left) & (right) transgenic female

Male mouse (left) & (right) transgenic female

G352/0002

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Credit

MEDICAL RESEARCH COUNCIL / SCIENCE PHOTO LIBRARY 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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Model release not required. Property release not required.

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