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Complex protein molecule on the surfaces of T cells that recognizes bits of foreign antigen bound to self-­MHC molecules.

FK Reading Ease
42.7

FK Grade Level
College
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    A small white blood cell that recognizes antigen fragments bound to cell surfaces by specialized antibody-­like receptors. “T” stands for the thymus gland, where T cells develop and acquire their receptors.

    FK Reading Ease
    50.5

    FK Grade Level
    High School
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    An immature cell from which other cells derive. Bone marrow is rich in the kind of stem cells that become specialized blood cells.

    FK Reading Ease
    81.1

    FK Grade Level
    Elementary School
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    A lymphoid organ in the abdominal cavity that is an important center for immune system activities.

    FK Reading Ease
    26.7

    FK Grade Level
    College
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    The clear liquid that separates from the blood when it is allowed to clot. This fluid contains the antibodies that were present in the whole blood.

    FK Reading Ease
    76.5

    FK Grade Level
    Elementary School
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    FK Reading Ease
    57.2

    FK Grade Level
    Middle School
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    FK Reading Ease
    44.4

    FK Grade Level
    High School
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    FK Reading Ease
    57.2

    FK Grade Level
    Middle School
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    A large white blood cell that contributes to immune defenses by ingesting microbes or other cells and foreign particles.

    FK Reading Ease
    40.6

    FK Grade Level
    College
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    FK Reading Ease
    31.5

    FK Grade Level
    High School
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