Fig. 7. Strength (MPa) of mineralized vertebrae (yellow) (approximately 50% mineral by dry mass) and demineralized vertebrae (blue) (<15% mineral by dry mass) at various strain rates (% s^–1). We found mineralized vertebrae were significantly stronger than demineralized vertebrae at all strain rates (P<0.001). Strength of mineralized vertebrae increases significantly with increasing strain rate (F_3,96=4.978; P<0.01). Strength does not differ with strain rate in the demineralized vertebrae (P=0.142). Letters above the box and whisker plot denote significant differences.