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Mineral-to-collagen ratio (ν1PO4/Amide I) (a), type B carbonate substitution (CO3/ν1PO4) (b), and crystallinity (c). Representative femur spectra from both groups (d). Statistical analysis was performed with the Mann Whitney test to compare the hindlimb unloading (HLU) group to the control (CON) group * (P < 0.05).
