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Update to Avantor’s response to the coronavirus (COVID-19) pandemic

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Supplier:  Southern Biotechnology
Description:   CD62L, also known as L-selectin, is a type I transmembrane glycoprotein with lectin-like and epidermal growth factor-like domains. It binds to sialylated oligosaccharide determinants on high endothelial venules (HEV) in peripheral lymph nodes. In the mouse, CD62L is expressed on most thymocytes and on peripheral leukocytes, including B and T lymphocytes, neutrophils, monocytes, and eosinophils. This member of the selectin family of cell adhesion molecules appears to be required for lymphocyte homing to peripheral lymph nodes and for leukocyte extravasation at sites of inflammation. Expression of CD62L on lymphocytes and neutrophils is rapidly down-regulated upon cell activation and the level of CD62L expression, along with other markers, distinguishes naive T cells from effector/memory T cells. The monoclonal antibody MEL-14 blocks in vitro binding of lymphocytes to peripheral lymph node HEV and inhibits in vivo lymphocyte extravasation into peripheral lymph nodes and the late stages of leukocyte rolling.
Catalog Number: (101442-622)

Supplier:  Southern Biotechnology
Description:   Goat Anti-Mouse IgG-CY5 antibody with minimal reactivity to human proteins for use in flow cytometry, immunohistochemistry / immunocytochemistry, and western blotting assays.

Supplier:  Southern Biotechnology
Description:   Interleukin-21 (IL-21) is a four helical bundle type I cytokine. The mature form of human IL-21 is a 131 amino acid protein. IL-21 is expressed primarily by NKT and CD4+ T cells, particularly the inflammatory Th17 subset, and has pleiotropic effects on both innate and adaptive immune responses. The effects of IL-21 include promotion of antibody production, NK cell differentiation, proliferation and differentiation of cells of monocyte and granulocyte lineages, costimulation of T cells, and augmentation of antitumor activity of CD8+ T cells. Studies have shown that IL-21 is also an autocrine cytokine that potently induces Th17 differentiation and suppresses Foxp3 expression, and serves as a target for treating inflammatory diseases.

Supplier:  Southern Biotechnology
Description:   Purified Anti-Chicken IgY antibody for use in flow cytometry, immunohistochemistry / immunocytochemistry, ELISA, and immunoprecipitation assays.
Catalog Number: (103264-798)

Supplier:  Southern Biotechnology
Description:   Goat Anti-Human Ig Fab-Biotin antibody for use in ELISA assays.

Supplier:  Southern Biotechnology
Description:   In the mouse, CD8 exists in two forms – (i) a CD8 heterodimer composed of an α chain (CD8α) and a β chain (CD8β); and (ii) a homodimer of two α chains. The heterodimer is found on the surface of essentially all thymocytes and the “suppressor/cytotoxic” subpopulation of mature T lymphocytes. Subsets of intestinal intraepithelial lymphocytes express CD8α without CD8β. It has been suggested that CD8+β- T cells mature extrathymically, while development of the CD8α+β+ population of T cells is thymus-dependent. CD8 acts as a coreceptor with MHC Class I-restricted T cell receptors in antigen recognition and positive selection of MHC class I-restricted CD8+ T cells. In vivo and in vitro treatment with the 53-6.7 monoclonal antibody effectively depletes CD8α+ cells. The 53-6.7 monoclonal antibody also blocks allogeneic help specific for class I MHC antigens and T cell responses to IL-2.
Supplier:  Southern Biotechnology
Description:   CD11b (integrin αM subunit) combines with CD18 (integrin β2 subunit) to form the integrin Mac-1, also known as complement receptor 3 (CR3), which mediates adhesion to C3bi and ICAM-1 (CD54). Mac-1 is expressed at varying levels on granulocytes, macrophages, dendritic cells, NK cells, and B-1 cells in the peritoneal and pleural cavities. In addition to its role in binding C3bi on opsonized targets and mediation of the subsequent ingestion process, Mac-1 is important as an adhesion molecule in the transendothelial migration of monocytes and neutrophils.
Supplier:  Southern Biotechnology
Description:   CD33 is a 67 kDa type I transmembrane glycoprotein and a member of the sialoadhesin family of cell surface receptors. It is absent from pluripotent stem cells but appears on myelomonocytic precursors after CD34. It then continues to be expressed on both the myeloid and monocyte lineages. While it has been reported that CD33 can function as a sialic acid-dependent cell adhesion molecule, cells expressing CD33 require desialylation before they can bind cells bearing the appropriate sialoglycoconjugates. This suggests that inhibitory cis interactions may regulate or block any adhesion function.
Supplier:  Southern Biotechnology
Description:   CD20 is a 33-37 kDa unglycosylated phosphoprotein. Although not a member of the tetraspanin superfamily of cell surface receptors, it crosses the cell membrane four times. It is expressed on all stages of B cell differentiation except plasma cells. The CD20 molecule is involved in regulation of B cell differentiation presumably via its reported function as a Ca++ channel subunit.
Supplier:  Southern Biotechnology
Description:   Ly-6G/Ly-6C, formerly known as the myeloid differentiation antigen Gr-1, is a GPI-anchored protein. In the bone marrow, the level of antigen expression is directly correlated with granulocyte differentiation and maturation. It is also transiently expressed on monocytes in the bone marrow. In the periphery, Ly-6G/Ly-6C is expressed predominantly on neutrophils.
Supplier:  Southern Biotechnology
Description:   CD11b is the 165 kDa αM chain which combines with the CD18 β2 integrin subunit to form the Mac-1 heterodimer. It is expressed on activated lymphocytes, monocytes, granulocytes and a subset of NK cells. CD11b functions in cell-cell and cell-substrate interactions and is a ligand for C3bi, CD50 (ICAM-3), CD54 (ICAM-1) and CD102 (ICAM-2).
Supplier:  Southern Biotechnology
Description:   Murine CD38, a type II transmembrane glycoprotein, is a bifunctional ectoenzyme capable of catabolizing nicotinamide adenine dinucleotide (NAD+) to cyclic ADP-ribose (cADPR), and then hydrolyzing cADPR to adenosine diphosphoribose (ADPR). It is expressed at high levels on the surface of peripheral B-lineage cells and at low density on germinal center B cells from unimmunized mice. It has also been reported to be expressed at moderate levels on NK cells, a proportion of peripheral T cells, and a subpopulation of thymocytes which are mostly TCRαβ+, CD4-, CD8-. Murine CD38 is also expressed by all Mac-1+ macrophages in the peritoneal cavities of unimmunized mice but not by unstimulated bone-marrow-derived macrophages. Monoclonal antibodies to CD38 have been shown to induce B and T cell proliferation, protect B cells from apoptosis, and inhibit B lymphopoiesis.

Supplier:  Southern Biotechnology
Description:   Interleukin-31 (IL-31) is a 24 kDa α-helical protein and a member of the IL-6 family of cytokines that is preferentially expressed by CD4+ T cells. This cytokine elicits its response by binding to a heterodimeric complex consisting of a gp130-like receptor chain and the oncostatin M receptor subunit. On target cells which include a broad range of immune and non-immune cells, IL-31 binding can induce activation of the Jak/STAT, AKT, and MAPK signaling pathways. Due to the ubiquitous expression of its receptor complex, IL-31 has numerous physiological roles that include regulating hematopoiesis and immune response. Over-expression has been linked to chronic inflammatory states such as dermatitis, pruritus, airway hypersensitivity, and inflammatory bowel disease.
Supplier:  Southern Biotechnology
Description:   Goat Anti-Rabbit IgG Fab-HRP antibody with minimal reactivity to mouse and human serum proteins for use in ELISA assays.
Supplier:  Southern Biotechnology
Description:   The BC96 monoclonal antibody reacts with human CD25, the 55 kDa interleukin-2 receptor α chain (IL-2Rα). CD25 is expressed by early progenitors of T and B lineage as well as by activated mature T and B lymphocytes. By itself, CD25 binds IL-2 only with low affinity. However, CD25 associates with CD122 (IL-2 receptor β chain) and CD132 (common γ chain) to form the high affinity IL-2 receptor. CD25 plays a role in lymphocyte differentiating and activation/proliferation. CD25 is expressed on activated B cells, monocytes/macrophages, and T cells.

Supplier:  Southern Biotechnology
Description:   Goat Anti-Rabbit IgG-AP antibody for use in ELISA, immunohistochemistry / immunocytochemistry, and western blotting assays.
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Stock for this item is limited, but may be available in a warehouse close to you. Please make sure that you are logged in to the site so that available stock can be displayed. If the call is still displayed and you need assistance, please call us at 1-800-932-5000.
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