“Deucravacitinib was evaluated in two pivotal repeat-dose general toxicity studies, one in rats and the other in monkeys.”
✓ VerifiedFDA multi-discipline review, p. 55Source ↗
Why that species
Similar metabolite profiles across species; every human metabolite detected in rats, no unique human metabolites
“All metabolites present in humans were present in at least 1 of the nonclinical safety species, with every human metabolite being detected in rats, and there were no unique human metabolites.”