Glossary
- X-Chromosome: a sex chromosome in both males and females (males have one X-chromosome, XY=male, and females have two X-chromosomes, XX=females).
- X-Linked Protoporphyria (XLP): a cutaneous type of porphyria caused by a mutation in Exon 11 of the ALAS2 gene, possibly resulting in an overproduction of protporphyrins.