Extended Data Figure 4: Cross-sectional slices reveal the consistent presence of a single line of arrested growth in the mandible and appendicular skeleton of MPC-D102/109.

a, Longitudinal sections of skull (left) and left mandibular ramus (right) of MPC-D102/109 that indicate the locations of the virtual samples for slices shown in b (blue) and c (red). b, Transverse section of left mandibular ramus. c, Longitudinal cross-section of left mandibular ramus in dorsoventral plane. d, Cross-section of left humerus at mid-shaft. e, Cross-section of right femur shaft. f, Cross-section of left femur shaft. g, h, Cross-sections of right tibia distal shaft. i, Cross-section of left tibia proximal shaft. j, Cross-section of right metatarsal IV proximal shaft. White arrows indicate lines of arrested growth (LAGs). Scale bars, 2 mm (a–c), 0.8 mm (d), 1 mm (e–h) and 0.9 mm (j). Sections in a–c were extracted from the dataset with an isotropic voxel size of 2.25 μm, and volume reconstruction that followed a phase retrieval approach, as single slices in VGStudio MAX 2.2.6. The section in d was extracted from the dataset with an isotropic voxel size of 2.2 μm and volume reconstruction that followed a phase retrieval approach, and then recoded for improved contrast with the thick-slab mode set to 100 μm in the ‘minimum’ combine algorithm of VGStudio MAX 2.2.6. Sections in e–j were extracted from the dataset with an isotropic voxel size of 53.58 μm and volume reconstruction that followed a phase retrieval approach, with the thick-slab mode set to 100 μm in the ‘minimum’ combine algorithm of VGStudio 3.0.2.