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(A) Raman spectra of MSCs during osteogenic differentiation from 900 to 1800 cm−1. (B) Magnified detail region for species from 900 to 1020 cm−1 in stack diagram. OCP at 957 cm−1 decreased upon osteogenic differentiation; β-TCP at 970 cm−1 transiently appeared at Day 9 and HAP at 960 cm−1 significantly increased after day9.
