c("patient: Patient 1", "group: non-lesional", "tissue: skin")
c("patient: Patient 2", "group: non-lesional", "tissue: skin")
c("patient: Patient 3", "group: non-lesional", "tissue: skin")
c("patient: Patient 1", "group: lesional", "tissue: skin")
c("patient: Patient 2", "group: lesional", "tissue: skin")
c("patient: Patient 3", "group: lesional", "tissue: skin")