Salmonella bacteria sent into outer space responded to the altered gravity by becoming more virulent, with changed expression of 167 different genes, according to a study published in the Proceedings of the National Academy of Sciences.
"These bugs can sense where they are by changes in their environment," said Cheryl Nickerson, from the Center for Infectious Diseases and Vaccinology at Arizona State University (ASU). "The minute they sense a different environment, they change their genetic machinery so they can survive."
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