PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 8281497-5 1993 The presence of glycogen in the tumor cells was demonstrated by periodic acid-Schiff (PAS) stain but immunoreactivity for cytokeratin, epithelial membrane antigen, leukocyte common antigen, desmin, actin and neuron-specific enolase were absent; vimentin was present. Glycogen 16-24 enolase 2 Homo sapiens 208-231