Can the protein-oligo kit be used to link a single nucleotide or a 2 or 3-mer oligo to an antibody?

You would not be able to use our Antibody-Oligo kit for this kind of project. The shortest oligo we have tested is a 15-mer. However, we do have a custom conjugation group here that works on special projects. We could make a nucleotide with our 4FB linker or a 3-mer with 4FB and conjugate that to a HyNic-modified antibody.