One of three categories of human milk oligosaccharides on base of their structure: Neutral, non-fucosylated HMO are linked with at least one galactose, N‑acetyllactosamine, or lacto‑N‑biose unit. They are neither linked with fucose nor sialic acid. Representatives of this category are lacto-N-neotetraose (Kunz et al. 2000) or 3'‑galactosyllactose (Ayechu-Muruzabal et al. 2018).