by Stefanie Seltmann, Berlin Institute of Health Imaging mass spectrometry analysis of murine critical-size femur fractures treated with in vitro engineered human stromal cell–derived cartilage discs. (A to D) Segmentation maps were generated from the mass-to-charge (m/z) value spectra of whole tissue sections of BMSC-derived (A and B) and ATSC-derived (C and D) transplant groups...