Chlorate inhibition of sulfation does not block KG1a L-selectin ligand activity. Representative results of adherence assay are shown as performed on (A) untreated KG1a; (B) KG1a immediately after neuraminidase treatment; and (C) KG1a 24 hours after neuraminidase treatment, cultured in the presence of 10 mmol/L sodium chlorate. The small solid circles are lymphocytes adherent to large, pale KG1a cells (methyl green-thionine stain, original magnification × 250).