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Sca1, also known as Ly6A/E, is a member of the Ly6 multigene family of type V glycophosphatidylinositol anchored cell surface proteins. It is expressed on multipotent hematopoietic stem cells in bone marrow of mice with both the Ly6.1 and Ly6.2 allotypes. In the periphery, Sca1 exhibits a pattern of expression which is based on differences between the two allotypes. Ly6.1 strains (e.g., A, BALB/c, CBA, C3H/He, DBA/1, NZB) have few Sca1+ resting peripheral lymphocytes, whereas Ly6.2 strains (e.g., AKR, C57BL, C57BR, C57L, DBA/2, PL, SJL, SWR, 129) have relatively high numbers of Sca1+ lymphocytes. The expression of Sca1 is dramatically upregulated in all strains upon cellular activation.
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Protein Aliases: locus A/E; Locus AE; Ly-6E; Ly6A; Lymphocyte antigen 6E; retinoic acid induced gene E; Retinoic acid-induced gene E protein; RIG-E; SCA-2; Stem cell antigen 2; Thymic shared antigen 1; TSA-1
Gene Aliases: 9804; Ly67; LY6E; RIG-E; RIGE; SCA-2; SCA2; TSA-1; TSA1
UniProt ID: (Human) Q16553, (Mouse) Q64253
Entrez Gene ID: (Human) 4061, (Mouse) 17069
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