NASA	National Aeronautics and Space Administration
ISS	International Space Station
LEO	Low Earth Orbit
hMSCs	human Mesenchymal Stem Cells
ANP	Atrial Natriuretic Peptide
hiPSC-CM	human induced Pluripotent Stem Cell–Derived Cardiomyocytes
Hi-SEAS	Hawaii Space Exploration Analog and Simulation
PGCs	Primordial Germ Cells
SCFA	Short-chain fatty acids
ROS	Reactive oxygen species
BDNF	Brain-derived neurotrophic factor