PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 2324552-2 1990 Using Meg-CSF-enriched fractions, we established that the moiety has the following characteristics: 1) portions of the molecules having Meg-CSF activity have sialic acid, probably with a biantennary structure, and beta-galactose residues as the terminal and penultimate sugars; 2) disulfide residues are an essential chemical group of the molecule and are located on its surface; and 3) Meg-CSF activity is stable in n-propanol, but not in acetonitrile with trifluoroacetic acid. beta-D-galactose 214-228 thrombopoietin Homo sapiens 136-143