Precision Immunization (1 of 3) (IMAGE)

NASA/Johnson Space Center

Precision Immunization (1 of 3)

Caption

NASA astronaut Scott Kelly gives himself a flu shot for an ongoing study on the human immune system. The vaccination is part of NASA's Twins Study, a compilation of multiple investigations that take advantage of a unique opportunity to study identical twin astronauts Scott and Mark Kelly, while Scott spends a year aboard the International Space Station and Mark remains on Earth.

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NASA

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