…et al., 1981; Kopp et al., 1992; Tiruppathi et al., 1996; Blazejewski et al., 1997), a glycoprotein that has been shown to be involved in protein binding (especially of albumin) in other epithelia (Kopp et al., 1992; Blazejewski et al., 1997), could perform this function at the blood–CSF interface.