library_construction_protocol: 6mm tissue-biopsies were obtained from back skin, and preputial glands as a whole were dissociated using Miltenyi MACS whole skin dissociation kit libraries were prepared using Chromium Next GEM Single Cell 3´GEM, Library & Gel Bead Kit v3.1, Chromium Nexxt GEM Chip G Single Cell Kit and Single Index Kit T Set A (all 19x Genomics, Pleasanton, CA, USA)