Present viral peptides only in MHC class II molecules

Present viral peptides only in MHC class I molecules

Present to CD4 T cells or CD8 T cells depending on which T cell engages peptide:MHC first

Present viral peptides in both MHC class I and MHC class II molecules

Migrate to the B cell zone to activate antigen specific B cells

Undergo clonal expansion

Secrete IL-2

Kill the dendritic cell to rid it of pathogen

The antibody isotypes IgG and IgA bind to the same Fc receptor

The Fc receptor on a macrophage can also be triggered by complement bound to antibody

The Fc receptor for IgE has the highest affinity of all the Fc receptors

The engagement of an Fc receptor always leads to activation

Enter the infected cell to neutralise and prevent viral replication

Bind to virus presented on MHC by the infected cell to induce antibody dependent cellular cytotoxicity

Prevent released virus from binding to adjacent cells

Present virus to T cells to boost the immune response

Presenting captured antigen to T cells

Triggering an outcome that results in cells being punctured with holes

Labelling bacteria for phagocytes

Stopping a virus from infecting gut epithelium

Transport antigen to the variable region of the antibody

Increase the affinity of the antibody molecule

Opsonise target structures

Trigger NK cells

It does not lead to formation of C5 convertase

It generates the proinflammatory fragments C4a and C5a, but not C3a

It is initiated by both IgG and IgM binding to antigens

It is initiated by mannose binding lectin (MBL) binding to microbial cell surfaces

Complement membrane attack complex (MAC)

Complement protein C3b

IgE

IgA

It must first bind to antigen to enable complement binding

Free unbound IgM is preloaded with complement to ensure a rapid response upon antigen binding

It is the only antibody that can activate complement

Two molecules of IgM must first bind to antigen to enable complement to bind

IgG, IgE, and IgA use the same secretory structures to transport antibodies across tissues

The ability of IgA to be secreted into breast milk is via the neonatal Fc receptor

IgG is primarily transferred to neonates via the placenta 

Secretory IgA in the gut lumen is hetrodimeric (composed of different sets of immunoglobulin chains), so that it can bind to two different antigens