title: Activity standard of donor endothelial cells in penetrating keratoplasty.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D016039:Corneal Transplantation; D004728:Endothelium, Corneal / Q000033:anatomy & histology*; D005125:Eye Banks; D005500:Follow-Up Studies; D006801:Humans; D007223:Infant; D008875:Middle Aged