TH and type 1 diabetes mellitus: We used optical clearing (iDISCO) methods and large tissues slices and 3D image analysis by Neurolucida360 to test for alterations in exocrine TH axon volume and length between the three groups (4947 ± 2348 axons/donor (range 1381–8197/donor), n = 5 ND, n = 4 AAb, n = 4 T1D).