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FTIR spectra of hydrogel samples for body fluid and cell-derived mineral apatite samples. (A) FTIR spectral overlay of 10% GelMA blocks compared against cell-laden samples osteogenically stimulated for 21 days, (B) spectral overlay of 10% GelMA blocks and hydrogels incubated in 2 × -mSBF after 5 days. The composition of the mineral was not expected to change with increasing mineral masses. FTIR, Fourier-transform infrared spectroscopy.
