Page 1550 - Veterinary Immunology, 10th Edition

to distant tissue sites.
VetBooks.ir Marsupials The order containing the pouched mammals. These

include not only the Australian forms such as kangaroos and
koalas but also the opossums.

Maternal antibodies Antibodies that originate in the mother but
enter the bloodstream of her offspring either by transport across
the placenta, as in primates, or by adsorption of ingested
colostrum, as in other mammals.

Medulla The region in the center of lymphoid organs such as the
thymus or lymph nodes.

Memory cells A subpopulation of long-lived lymphocytes formed
in response to antigen. On second response to that antigen, they

mount a faster and stronger immune response.

Memory response The enhanced immune response that is

triggered as a result of exposing a primed animal to antigen.

Mesangial cells Modified muscle cells found within a glomerulus.

MHC molecules Proteins coded for by genes located in the major
histocompatibility complex.

MHC restriction The necessity for a T cell to recognize an antigen
in association with an MHC molecule. It is required for helper

and cytotoxic T cells to recognize antigen and for helper T cells
to cooperate with B cells.

Microbiome The collective term for all the microbial genomes
contained within the microbiota.

Microbiota The collective term for the microbial populations that
colonize body surfaces.

Microglia Macrophages resident within the brain.

Mitogen Any substance that makes cells divide.

Mixed lymphocyte reaction Lymphocyte proliferation induced by

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