PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 24864245-2 2014 Here, in the present study, we have synthesized a series of N,N,N",N"-tetramethylguanidinium-polyethylenimine (TP1-TP5) polymers via a single-step reaction involving peripheral primary amines of bPEI and varying amounts of 2-(1H-benzotriazol-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate (HBTU). n,n,n",n"-tetramethylguanidinium-polyethylenimine 60-109 transition protein 1 Homo sapiens 111-114