in light of the recent findings that human serum contains a glycan-phosphatidyl-inositol-specific phospholipase d , which converts daf from a hydrophobic to a hydrophilic form lacking the crd , the observation that the phosphate is crucial for expression of the epitope may be relevant in understanding the origin of crd-negative daf in urine and plasma .
C0229671
serum
C0032105
plasma