PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 29924583-0 2018 Arg-Phe-Phe d-Amino Acid Stereochemistry Scan in the Macrocyclic Agouti-Related Protein Antagonist Scaffold c[Pro-Arg-Phe-Phe-Xxx-Ala-Phe-DPro] Results in Unanticipated Melanocortin-1 Receptor Agonist Profiles. d-amino acid 12-24 melanocortin 1 receptor Homo sapiens 169-192