LY6D (Lymphocyte Antigen 6 Family Member D) is a Protein Coding gene. It may act as a specification marker at the earliest stage specification of lymphocytes between B- and T-cell development. Marks the earliest stage of B-cell specification. The expression of LY6D is induced in MCF10A cells by X-ray irradiation. The induction of LY6D expression is triggered through a pathway regulated by ATM, CHK2, and p53. This method is a new Ab-directed proteomic strategy for the analysis of membrane proteins and applies to various biological phenomena in situations in which both target molecule-expressing cells and nonexpressing cells are available. Diseases associated with LY6D include Alzheimer's Disease 16 and Inferior Myocardial Infarction.