Immune System
Macrophages are professional antigen- presenting cells. The protein molecule through which they present antigen in human is

HLA
actin
interleukin
CD8

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Immune System
Polymorphonuclear leukocytes (or PMNs)

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

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Immune System
Which of the following is correct for isoantigens?

They are antigens found in all members of different species
They are antigens found in some members of a species
They are antigens found in some members of different species
They are antigens found in all members of a species

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