This application describes an antibody that specifically binds to a synthetic
oligomer (e.g., an oligonucleotide or oligopeptide) having a organic protecting
group covalently bound thereto, which antibody does not bind to that synthetic
oligomer when the organic protecting group is not covalently bound thereto. Methods
of making and using such antibodies are also disclosed, along with cells for making
such antibodies and articles carrying immobilized oligomers that can be used in
assay procedures with such antibodies.