PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 9258444-5 1997 To improve cellular uptake of a PNA sequence, it was conjugated to a D-amino acid analog of insulin-like growth factor 1 (IGF1), which binds selectively to the cell surface receptor for insulin-like growth factor 1 (IGF1R). Peptide Nucleic Acids 32-35 insulin-like growth factor I receptor Mus musculus 216-221