T-lymphocyte activation antigen CD86 isoform X1.

Programmed cell death 1 ligand 1 isoform X2.

T-cell-specific surface glycoprotein CD28.

T-cell surface glycoprotein CD4; Integral membrane glycoprotein that plays an essential role in the immune response and serves multiple functions in responses against both external and internal offenses. In T-cells, functions primarily as a coreceptor for MHC class II molecule:peptide complex. The antigens presented by class II peptides are derived from extracellular proteins while class I peptides are derived from cytosolic proteins. Interacts simultaneously with the T-cell receptor (TCR) and the MHC class II presented by antigen presenting cells (APCs). In turn, recruits the Src kina [...]

Tumor necrosis factor receptor superfamily member 5 isoform X1.

CD40 ligand; Cytokine that acts as a ligand to CD40/TNFRSF5. Costimulates T-cell proliferation and cytokine production. Involved in immunoglobulin class switching.

Interleukin-4; Participates in at least several B-cell activation processes as well as of other cell types. It is a costimulator of DNA-synthesis. It induces the expression of class II MHC molecules on resting B-cells. It enhances both secretion and cell surface expression of IgE and IgG1. It also regulates the expression of the low affinity Fc receptor for IgE (CD23) on both lymphocytes and monocytes. Belongs to the IL-4/IL-13 family.

B-lymphocyte antigen CD19 isoform X1.

Inducible T-cell costimulator isoform X1.