GM16024 was transformed from lymphocytes of a female XP patient who carried a C to T transition in exon 4 in her paternal XPG allele that leads to a truncated XPG and a G to A transition in codon 874 in her maternal allele that converts alanine874 to threonine874 [17]. This evidence concerns the gene ERCC5 and xeroderma pigmentosum.