XBP1 and vitiligo: To evaluate the role of regulatory and coding variants within XBP1 in the development of vitiligo, we sequenced all the 5 exons, exon-intron boundaries as well as 362 bp 5′ upstream (containing putative regulatory elements) and 946 bp 3′ downstream sequences of XBP1 in 319 patients of vitiligo and 294 normal controls (Figure S1).