Human leukocyte antigens (HLAs) are found on

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Study for the Success! In Clinical Laboratory Science – Immunology Test. Prepare with flashcards and multiple choice questions, each question offers hints and explanations. Get ready for your exam!

Multiple Choice

Human leukocyte antigens (HLAs) are found on

Explanation:
HLAs are part of the major histocompatibility complex that presents peptide antigens to T cells. The class I HLA molecules are expressed on almost all nucleated cells, which is why they are found broadly across most body tissues. Red blood cells lack a nucleus, so they do not express HLA molecules, making HLAs absent on these cells. While HLA class II is restricted mainly to professional antigen-presenting cells, the widespread presence of HLA class I on nucleated cells is what the statement captures. The other options mistakenly limit HLAs to a single cell type or state, which isn’t accurate.

HLAs are part of the major histocompatibility complex that presents peptide antigens to T cells. The class I HLA molecules are expressed on almost all nucleated cells, which is why they are found broadly across most body tissues. Red blood cells lack a nucleus, so they do not express HLA molecules, making HLAs absent on these cells. While HLA class II is restricted mainly to professional antigen-presenting cells, the widespread presence of HLA class I on nucleated cells is what the statement captures. The other options mistakenly limit HLAs to a single cell type or state, which isn’t accurate.

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