No immune-system effects in repeat-dose studies; no immunotoxicity studies
“No immunotoxicity assessments were performed as no sepiapterin-related effects on the immune system were observed in repeat-dose mammalian toxicology studies.”
Low, non-retained distribution to melanin-containing tissues (meninges, uveal tract); no melanin association
“Distribution of radioactivity to certain melanin-containing tissues, such as the meninges and uveal tract was low and there was no extended retention, indicating that [14C]-sepiapterin-derived radioactivity was most likely not associating with melanin in these tissues.”
Dose-related reversible and non-reversible kidney toxicity in rat repeat-dose studies
“Dose-related reversible and non-reversible kidney toxicities were the main clinically relevant nonclinical safety signal identified from the rat repeat dose toxicity studies.”