| http://www.w3.org/ns/prov#value | - A particular group of compounds of interest are haptens of from about 125 to 1,000 molecular weight, usually not more than 750 molecular weight, having from 1 to 10, usually 1 to 8 heteroatoms, which are primarily oxygen, sulfur, nitrogen, phosphorus, alkali metal cations, e.g. sodium and potassium, and halide, e.g. chloride, bromide and iodide.
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