Furthermore, expression of genes involved in glycosylation of mucins and sialic acid metabolisms, namely sialyltransferase ST8SIA4, ST6GALNAC2, mannosidase MAN1A1, and acetylglucosaminyltransferase B3GNT8, was also validated as unique to CF (Figure 6). This evidence concerns the gene ST6GALNAC2 and cystic fibrosis.