https://www.mdpi.com/1420-3049/24/18/3287
This paper describes using a microbial transglutamase to put an azide group in a peptide onto the terminal carboxylic acid of an antibody protein, then using Cu-free click chemistry to affix an antisense oligo at that site. They didn't use Morpholinos, but in principle one could.
Huggins IJ, Medina CA, Springer AD, van den Berg A, Jadhav S, Cui X, Dowdy SF. Site Selective Antibody-Oligonucleotide Conjugation via Microbial Transglutaminase. Molecules. 2019 Sep 10;24(18). pii: E3287. doi: 10.3390/molecules24183287.
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