proof for the presence of long chain multimers of sialic acid was based on two types of experiments which utilized : 1 ) a glycopeptide fraction of chp-134 cells , labeled metabolically with d- [ 3h ] glcn and 2 ) a membrane fraction from chp-134 cells which served as an exogenous acceptor of [ 14c ] neunac residues in an escherichia coli k1 sialyltransferase assay .
C0007634
cells
C0007603
membrane