In glycosylphosphatidylinositol (GPI)-anchor biosynthesis, the GPI-ethanolamine-phosphate transferase III complex catalyzes the addition of ethanolamine-phosphate (EtNP) to mannose-mannose-(EtNP)mannose-N-acetyl glucosamine-(acyl)phosphatidylinositol generating EtNP-Man-Man-(EtNP)Man-GlcN-(acyl)PI. (Adapted from
PMID:26563290).