AP3B1 and Hermansky-Pudlak syndrome with neutropenia: Indeed, patients with a mutation affecting the related AP-3 complex (AP3B1 mutation, OMIM*603401), or Hermansky-Pudlak syndrome 2 (HPS2) [45], [46], have recently been reported to present with both recurrent bacterial infections and developmental delay, poor balance and intention tremor [47].