ST6GAL1 and neoplasm: We found that ST6GAL-1 protein was only in a subset of cells within the base of the crypts (stem cell compartment) of the normal tissues (similar to prior work; Fig. 2C), but that in the human rectal adenocarcinoma samples, ST6GAL-1 was in some but not in all the adenocarcinoma cells in any given tumor (Fig. 2C).