Sonnet Biotherapeutics Holdings Inc. has announced the generation and in vitro characterization of two novel drug candidates, SON-1411 (IL18BPR-FHAB-IL12) and SON-1400 (IL18BPR-FHAB), each containing a modified version of recombinant human interleukin (IL)-18 (IL-18 binding protein resistant [IL-18BPR]).