Astronaut Nichole Ayers inserts blood samples into a science freezer

iss072e808609 (March 20, 2025) --- NASA astronaut and Expedition 72 Flight Engineer Nichole Ayers inserts a cryogenic storage unit, called a dewar, containing blood samples collected from a crew member into a science freezer for preservation and later analysis. The Minus Eighty-Degree Laboratory Freezer for International Space Station, or MELFI, is a research freezer that maintains experiment samples at ultra-cold temperatures in microgravity.