Definitions / Recently Added

FK Reading Ease
39.6

FK Grade Level
High School
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  • FK Reading Ease
    67.8

    FK Grade Level
    Middle School
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  • A family of proteins important for first-­line immune defenses against microbes.

    FK Reading Ease
    32.5

    FK Grade Level
    High School
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  • A state of immune nonresponsiveness to a particular antigen or group of antigens.

    FK Reading Ease
    30.9

    FK Grade Level
    College
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  • FK Reading Ease
    80.3

    FK Grade Level
    Elementary School
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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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