Peroxisome Biogenesis Disorder 4b, is also known as pbd4b, and has symptoms including ataxia, seizures and recurrent fevers. An important gene associated with Peroxisome Biogenesis Disorder 4b is PEX6 (Peroxisomal Biogenesis Factor 6). Affiliated tissues include liver and brain, and related phenotypes are macrocephaly and intellectual disability