illustration of a section of the spleen

Illustration of an antigen-presenting dendritic cell presenting MHC-I with bound peptide to a naive T8-lymphocyte

Animation of an MHC- I molecule on an antigen-presenting dendritic cell presenting a bound viral epitope to a naive T8-lymphocyte

Animation of an effector T4-lymphocyte interacting with an activated B-lymphocyte leading to proliferation and differentiation of the B-lymphocyte

Animation showing proliferentiation and differentation of a B-lymphocyte

Illustration of differentiation of B-lymphocytes into plasma cells and B-memory cells

Illustration of activation of a B-lymphocyte by way of LPS binding to toll-like receptors

Animation of MAClysis of a gram-negative bacterium

Animation of MAC damage to a viral envelope

Animation of MAC lysis of an infected human cell

Animation of binding of epitopes from exogenous antigens to MHC-II molecules in a dendritic cell

Animation of binding of epitopes from endogenous antigens to MHC- I molecules in a dendritic cell

Animation of neutralization of an exotoxin

Animation showing proliferation of a T4-lymphocyte

Illustration of activation of a B-lymphocyte through the cross linking of B-cell receptors by TI-2 antigens

opsonization of helminths by IgE

Animation of proliferation and differentiation of T8-lymphocytes

Illustration of a B-lymphocyte recognizing epitopes of a virus by way of B-cell receptors

Animation of binding of peptide epitopes from exogenous antigens to MHC-II molecules by a B-lymphocyte

Animation of binding of epitopes to corresponding B-cell receptors (BCR) on the surface of B-lymphocytes

neutralization of a virus

neutralization of a toxin

Illustration of proliferation of B-lymphocytes

Animation showing proliferentiation and differentation of a B-lymphocyte

Illustration of agglutination of bacteria

Animation of opsonization with IgG

Illustration of opsonization of a helminth by IgE

Illustration of a naive T4-lymphocyte recognizing epitope and MHC-II on an antigen-presenting dendritic cell

Animation of an MHC- II molecule on an antigen-presenting dendritic cell presenting a vound viral epitope to a naive T4-lymphocyte

Animation of activation of a macrophage by a Th1 lymphocyte

Animation of binding of epitopes from endogenous antigens to MHC- I molecules in an infected cell or tumor cell

Animation of a cytotoxic T-lymphocytes (CTL) using perforins and granzymes to induce apoptosis of a virus-infected cell

Animation of cytotoxic T-lymphocyte (CTL)-induced apoptosis of a virus-infected cell

Animation of neutralization of a virus

Animation of ADCC of an infected cell by NK cells

Animation of apoptosis by NK cells

illustration of opsonization

Animation of blocking bacterial adherence

illustration of a lymph node

B and T lymphocytes recognizing an antigen in a lymph node