Xeroderma Pigmentosum, Complementation Group a, also known as xeroderma pigmentosum group a, is related to xeroderma pigmentosum, complementation group b and skin benign neoplasm. An important gene associated with Xeroderma Pigmentosum, Complementation Group a is XPA (XPA, DNA Damage Recognition And Repair Factor), and among its related pathways/superpathways are Homology Directed Repair and Packaging Of Telomere Ends. Affiliated tissues include skin and brain, and related phenotypes are mental deterioration and pes cavus