P047: Interim results from the APHENITY extension study: Sepiapterin reduces blood Phe with improved dietary Phe tolerance in participants with phenylketonuria - Nicola Longo; Francjan van Spronsen; Ania Muntau; Lali Margvelashvili; Heidi Peters; Ida Vanessa Schwartz; Takashi Hamazaki; Maria Avanise Yumi Minami; Laura Guilder; Drago Bratkovic; Melissa Lah; Janet Thomas; et al. (Genetics in Medicine Open)