The contribution of the young De Castro, maybe the last direct disciple of Santiago Ramón y Cajal (1852-1934; awarded the 1906 Nobel prize in Physiology or Medicine) was overlooked at the time, but it was later recognized that he deserved to share the Nobel Prize with Heymans, his colleague and friend.
Det bidrag de unge, De Castro, der måske var den sidste direkte discipel af Santiago Ramón y Cajal (1852-1934; tildelt 1906 Nobelprisen i fysiologi eller medicin) blev glemt på det tidspunkt, men det er anerkendt verden over at han fortjente at dele Nobelprisen med Heymans, hans kollega og ven.