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aptamer
This term is used exclusively within the specialized registers of biochemistry, molecular biology, and pharmacology. It describes a synthetic oligonucleotide that mimics the function of an antibody, acting as a chemical "key" that fits into a specific molecular "lock."
Because aptamers are engineered in a laboratory rather than produced by the immune system, they are often discussed in the context of biosensors and targeted drug delivery. In technical literature, they are frequently contrasted with antibodies due to their smaller size and greater stability.