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PE Mouse Anti-Mouse Ly-49I
PE Mouse Anti-Mouse Ly-49I

Two-color analysis of Ly-49I expression on splenic NK cells. C57BL/6 splenocytes were simultaneously stained with APC-conjugated mAb PK136 (anti-mouse NK-1.1, Cat. No. 550627, both panels) and PE-conjugated mAb YLI-90 (right panel). Flow cytometry was performed on a FACSCalibur™ (BDIS, San Jose, CA).

Two-color analysis of Ly-49I expression on splenic NK cells. C57BL/6 splenocytes were simultaneously stained with APC-conjugated mAb PK136 (anti-mouse NK-1.1, Cat. No. 550627, both panels) and PE-conjugated mAb YLI-90 (right panel). Flow cytometry was performed on a FACSCalibur™ (BDIS, San Jose, CA).

Product Details
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BD Pharmingen™
Mouse (QC Testing)
Mouse BALB/c IgG1, κ
CHO-K1 cells transfected with the B6 allele of the Ly-49I gene, K1ra9
Flow cytometry (Routinely Tested)
0.2 mg/ml
Aqueous buffered solution containing ≤0.09% sodium azide.

Preparation And Storage

The monoclonal antibody was purified from tissue culture supernatant or ascites by affinity chromatography. The antibody was conjugated with R-PE under optimum conditions, and unconjugated antibody and free PE were removed. Store undiluted at 4°C and protected from prolonged exposure to light. Do not freeze.

Product Notices

  1. Since applications vary, each investigator should titrate the reagent to obtain optimal results.
  2. Please refer to for technical protocols.
  3. For fluorochrome spectra and suitable instrument settings, please refer to our Multicolor Flow Cytometry web page at
  4. Caution: Sodium azide yields highly toxic hydrazoic acid under acidic conditions. Dilute azide compounds in running water before discarding to avoid accumulation of potentially explosive deposits in plumbing.
550595 Rev. 3
Antibody Details
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The YLI-90 monoclonal antibody specifically reacts with the B6 alloantigen of Ly-49I, an inhibitory receptor which is expressed on subsets of natural killer (NK) cells, NK-1.1+ (or DX5+) T lymphocytes (NK-T cells), and on a population of memory CD8+ T lymphocytes in C57BL/6 mice, but not AKR/J, BALB/c, DBA/1, or SJL mice. The Ly-49 family of NK-cell receptors are disulfide-linked type-II transmembrane protein homodimers with extracellular carbohydrate-recognition domains (CRD). Ly-49I is closely related to Ly-49C[B6] and Ly49C[BALB], and these three alloantigens are recognized by mAb 5E6 (Cat. No. 553277). A Ly-49I[BALB] allele has not been found. The Ly-49 family members are expressed independently, such that an individual NK or T cell may display more than one class of Ly-49 receptor homodimers. Binding of Ly-49I-expressing transfectants to cell lines bearing MHC class I antigens of the b,d, k and s haplotypes was not detected. In contrast, Ly-49I-expressing transfectants were found to weakly bind lymphoblasts of the b, d, k, q, s, and v haplotypes and to strongly bind H-2[r] lymphoblasts. Ly-49I-bearing NK cells may mediate allogeneic and hybrid resistance to transplantation of H-2[d] bone marrow.

550595 Rev. 3
Format Details
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R-Phycoerythrin (PE), is part of the BD family of Phycobiliprotein dyes. This fluorochrome is a multimeric fluorescent phycobiliprotein with excitation maximum (Ex Max) of 496 nm and 566 nm and an emission maximum (Em Max) at 576 nm. PE is designed to be excited by the Blue (488 nm), Green (532 nm) and Yellow-Green (561 nm) lasers and detected using an optical filter centered near 575 nm (e.g., a 575/26-nm bandpass filter). As PE is excited by multiple lasers, this can result in cross-laser excitation and fluorescence spillover on instruments with various combinations of Blue, Green, and Yellow-Green lasers. Please ensure that your instrument’s configurations (lasers and optical filters) are appropriate for this dye.
Yellow-Green 488 nm, 532 nm, 561 nm
496 nm, 566 nm
576 nm
550595 Rev.3
Citations & References
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Development References (8)

  1. Brennan J, Lemieux S, Freeman JD, Mager DL, Takei F. Heterogeneity among Ly-49C natural killer (NK) cells: characterization of highly related receptors with differing functions and expression patterns. J Exp Med. 1996; 184(6):2085-2090. (Biology). View Reference
  2. Coles MC, McMahon CW, Takizawa H, Raulet DH. Memory CD8 T lymphocytes express inhibitory MHC-specific Ly49 receptors. Eur J Immunol. 2000; 30(1):236-244. (Immunogen). View Reference
  3. George T, Yu YY, Liu J, et al. Allorecognition by murine natural killer cells: lysis of T-lymphoblasts and rejection of bone-marrow grafts. Immunol Rev. 1997; 155:29-40. (Biology). View Reference
  4. Hanke T, Takizawa H, McMahon CW, et al. Direct assessment of MHC class I binding by seven Ly49 inhibitory NK cell receptors. Immunity. 1999; 11(1):67-77. (Biology). View Reference
  5. Lian RH, Li Y, Kubota S, Mager DL, Takei F. Recognition of class I MHC by NK receptor Ly-49C: identification of critical residues. J Immunol. 1999; 162(12):7271-7276. (Biology). View Reference
  6. Raulet DH, Held W, Correa I, Dorfman JR, Wu MF, Corral L. Specificity, tolerance and developmental regulation of natural killer cells defined by expression of class I-specific Ly49 receptors. Immunol Rev. 1997; 155:41-52. (Biology). View Reference
  7. Takei F, Brennan J, Mager DL. The Ly-49 family: genes, proteins and recognition of class I MHC. Immunol Rev. 1997; 155:67-77. (Biology). View Reference
  8. The Jackson Laboratory. Mouse Genome Database (MGD), Mouse Genome Informatics Web Site. Available: September, 2003.
View All (8) View Less
550595 Rev. 3

Please refer to Support Documents for Quality Certificates

Global - Refer to manufacturer's instructions for use and related User Manuals and Technical data sheets before using this products as described

Comparisons, where applicable, are made against older BD Technology, manual methods or are general performance claims.  Comparisons are not made against non-BD technologies, unless otherwise noted.

For Research Use Only. Not for use in diagnostic or therapeutic procedures.