Xeroderma Pigmentosum, Complementation Group B, also known as xeroderma pigmentosum group b, is related to xeroderma pigmentosum, complementation group a and xeroderma pigmentosum-cockayne syndrome complex, and has symptoms including ataxia An important gene associated with Xeroderma Pigmentosum, Complementation Group B is ERCC3 (ERCC Excision Repair 3, TFIIH Core Complex Helicase Subunit), and among its related pathways/superpathways are Processing of Capped Intron-Containing Pre-mRNA and Formation of HIV elongation complex in the absence of HIV Tat. Affiliated tissues include skin and b cells, and related phenotypes are intellectual disability and hyperreflexia