A process is disclosed for modifying a parent ligand by attaching to the parent ligand a conjugation agent that is reactive with a moiety of a target receptor to which the parent ligand binds such that a covalent bond is formable between the conjugation agent and the receptor moiety. Also disclosed are compositions, probes and methods of detecting and/or quantifying receptors using the modified ligands of the invention.

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> High lysine maize compositions and methods for detection thereof

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