O’Neill et al. (2001) described a large kindred in which several members had X-linked adrenoleukodystrophy and adrenomyelomyopathy due to deletions of the translation initiation codon and utilization of a downstream ATG codon in the ABCD1 gene ATP-binding cassette subfamily D member 1 that encodes a peroxisomal protein. Here, ABCD1 is linked to X-linked adrenoleukodystrophy.