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. 2022 Apr 8;12:5975. doi: 10.1038/s41598-022-10066-6

Figure 2.

Figure 2

Automated axon identification. (A) Part of a cross-section of a rat tibial nerve in a late regeneration stage, 12 weeks post-surgery, 7 mm distal to the nerve coaptation. Myelinated axons are shown as black circles. Osmium tetroxide postfixed, epoxy embedded, 1 µm thickness. A myelin split artifact and prominent unmyelinated axons are present in this section. (B) Manual segmentation of the image in A by a blinded investigator. Myelin split artifacts and unmyelinated axons are correctly classified. Although an irregularly shaped, compressed nerve fiber is correctly identified as such, its myelin sheath is not fully segmented (dashed circle). (C) Automated segmentation of the image in A using AxonDeepSeg. The myelin split artifact (white arrowhead) as well as prominent unmyelinated axons (white arrows) have been misinterpreted as myelinated axons. Myelin sheaths are shown in red and axons are shown in blue. Scale bar represents 5 µm. (Own illustration created with AxonDeepSeg).