the ability of murine tumor cells to metastasize spontaneously from subcutaneous sites is positively correlated with the total sialic acid content of the cells in culture , the degree to which the sialic acid is exposed on the tumor cell surface , and , most strongly , with the degree of sialylation of galactosyl and n-acetylgalactosaminyl residues in cell surface glycoconjugates .
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the
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cell surface