PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 26397833-2 2015 In this study, we performed radiosynthesis and biological evaluation of a new 18F-labeled RGD homodimeric peptide with one 8-amino-3,6-dioxaoctanoic acid (PEG2) linker on the glutamate beta-amino group (18F-FP-PEG2-beta-Glu-RGD2) as a symmetric PET tracer for tumor imaging. 2-(2-(2-Aminoethoxy)ethoxy)acetic acid 123-153 insulin-like growth factor 2 Mus musculus 155-159