“…Zhou et al [43] demonstrated the developmentally regulated expression of p-1,4-galactosyltransferase in the mouse brain; this enzyme is strongly expressed on day 16 of development, gradually declines thereafter and drops sharply after birth but remains detectable. During chick embryo development, p-NL1cetylglucosarninyltvansferase ZV activity increases, leading to the expression of more complex carbohydrate structures in 16-day-old embryos [44].…”