Scientists first identified DNA sequences in space, aboard the International Space Station. About their research, scientists reported in the journal Scientific Reports. Astronauts Peggy Whitson and Keith Rubins read almost complete sequences of E. coli genomes Escherichia coli, bacteriophage lambda, and mitochondrial DNA of a domestic mouse. Later, they conducted a full cycle of microorganism research on the ISS, starting with collecting samples, growing cell cultures from them, and ending with DNA sequencing. According to scientists, the flight to Mars can last from one and a half to three years. During this time, the immunity of space travelers is likely to function worse than on Earth. At the same time, the pathogenicity of microorganisms in conditions of weightlessness can grow, and the resistance of bacteria to antibiotics can also increase. Considering the flight time, the monitoring of the activity of microorganisms will have to be carried out on board the spacecraft.