Practice question
Question
Cluster of differentiation (CD) molecules are present on:
Explanation
CD molecules are surface glycoproteins used as immunophenotypic markers to identify leukocyte lineages, activation status and differentiation stages. Examples CD3 on T cells, CD19 on B cells, CD4 helper identity. Flow cytometry detects these cell-surface antigens, not cytoplasmic or organellar locations.
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