iss056e097518 (July 20, 2018) --- Expedition 56 Flight Engineer Ricky Arnold prepares amplified DNA collected from microbes living aboard the International Space Station for sequencing using the Biomolecule Sequencer. The Biomolecule Extraction and Sequencing Technology (BEST) investigation studies the use of DNA sequencing for the identification of unknown microbial organisms living on the station and to understand how humans, plants and microbes adapt to living in space.