Fig 2.

Impacts of the spore-specific structural attributes (exterior and interior) are displayed as relative sensitivities of spores lacking pigmentation, spore coat assembly, dipicolinic acid (DPA) formation, core dehydration, and α/β-type small, acid-soluble spore protein (SASP) formation to Mars(−)UV conditions (hatched bars; panel A) or Mars(+)UV conditions (shaded bars; panel B). Relative spore sensitivity was expressed as the ratio of the survival of each mutant strain with respect to the survival of the corresponding wild-type strain from the respective exposure to simulated Martian conditions (from Fig. 1B and C) to that of the ambient control (Fig. 1A). Data are averages and standard deviations (n = 3). The actual data values are shown above the corresponding columns (Fig. 1).