Zeleciment basivarsen (DYNE-101) is an antibody oligonucleotide conjugate (AOC), consisting of a Fab antibody named Zeleciment that binds to the transferrin receptor 1 (TfR1) on muscle cells, and an antisense oligonucleotide known as Basivarsen. This compound targets the RNA of the mutant dystrophia myotonica-protein kinase (DMPK) for RNase H-mediated degradation, and is utilized in the study of myotonic dystrophy type 1 (DM1).