Peroxisome Biogenesis Disorder 8b, is also known as pbd8b, and has symptoms including ataxia, constipation and paraparesis, spastic. An important gene associated with Peroxisome Biogenesis Disorder 8b is PEX16 (Peroxisomal Biogenesis Factor 16). Affiliated tissues include liver and brain, and related phenotypes are very long chain fatty acid accumulation and elevated circulating phytanic acid concentration