PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 32187531-5 2020 Our binding analyses further revealed that glycosaminoglycans, heparin and heparan sulfate, are ligands for OTK and thus may play a role in the Sema1a-PlexA axon guidance system. Glycosaminoglycans 43-61 off-track Drosophila melanogaster 108-111