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letter
. 2018 Nov 21;7:92. doi: 10.1038/s41377-018-0094-x

Fig. 4. Assessment of invasiveness.

Fig. 4

a Scale-preserved comparison of common endoscopic probes and a MMF. b Postmortem coronal brain section showing two fibre tracts of the MMF probe in the visual cortex and hippocampus. The arrows indicate the insertion tract of the MMF probe. The width of each tract is less than 50 µm. Scale bar, 200 µm