( ii ) there is a direct relationship between the glycocalyx and immunogenicity , and an inverse relationship with the metastasizing capacity of tumor cells , properties which can be quantitated by levels of the plasma membrane marker enzyme 5'-nucleotidase ( ec3.1.3.5 ; 5'-ribonucleotide phosphohydrolase ) activity ;
C0061622
glycocalyx
C0007603
plasma membrane