1 Environmental Cell Biology Group, Department of Microgravity and Translational Regenerative Medicine, Otto von Guericke University, 39106 Magdeburg, Germany.
2 Gravitational Biology Group, Department of Biology, Friedrich-Alexander University, 91058 Erlangen, Germany.
Cell death is a fundamental and highly organized biological phenomenon that was long considered nothing more than the inevitable endpoint of life; this is reflected in the meaning of the Greek word, ἀπόπτωσις ("falling leaves from a tree") [...].