Immune System
Which of the following(s) is/are the determinants of antigenicity?

Size of the antigen
Chemical nature
All of these
Foreignness

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Immune System
T cell receptors (or TCR) on CD4+ T cells

are secreted out into the environment to bind antigens
recognize peptides associated with MHC class I molecules
recognize peptides not associated with MHC molecules
recognize peptides associated with MHC class II molecules

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Immune System
Polymorphonuclear leukocytes (or PMNs)

are a type of phagocyte that can engulf and kill bacteria
All of these
can be attracted to the site of an infection following activation of complement
are derived from bone marrow stem cells

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