Classical EB in humans is classified into four types based on the level of detachment and the structural proteins involved: EB simplex (EBS, OMIM:PS131760), junctional EB (JEB, OMIM:PS226650), dystrophic EB (DEB, OMIM:120,120), and Kindler EB (KEB, OMIM:173,650). This evidence concerns the gene NAT9 and epidermolysis bullosa.