HLA-A and Schwartz-Jampel syndrome: For example, severe cutaneous adverse reactions are found to be triggered by allopurinol in the presence of B*5801 [44]; abacavir-induced skin reaction requires the parallel genotype of B*5701 [32]; and carbamazepin-induced SJS is linked to B*1502, but not to HLA-A*1101 [45].