There were these particles in breast milk that were found already in the 1930s called human milk oligosaccharides, but their function remained a mystery for decades and decades after their initial discovery.
La leche materna tiene unas partículas que se descubrieron ya en la década de 1930. Se llaman "oligosacáridos de la leche humana", pero se desconocía su función, y esta ignorancia duró décadas tras su descubrimiento inicial.