An external peptide calibration standard containing Bradykinin ([M + H] + 757.39), Angiotensin II ([M + H] + 1046.54), Angiotensin I ([M + H] + 1296.68), Substance P ([M + H]+ 1347.74),
Bombesin ([M + H] +1619.82), Renin substrate ([M + H]+ 1758.93), ACTH clip 1-17 ([M + H] + 2093.09), ACTH clip 18-39 ([M + H]+ 2465.20) and Somatostatin 28 ([M + H]+ 3147.47) (BrukerDaltonics) was used to calibrate the instrument.
(2) PSMA, prostate specific membrane antigen; scFv, single-chain variable fragment antibody; MMP2, metalloproteinase-2; LHRH, luteinizing-hormone releasing hormone; GRP, gastrin-releasing peptide; BB2, a subtype of the
bombesin receptor; RVG, rabies virus glycoprotein; dsRNA, double-stranded RNA binding domain; PLA, poly(D,L-lactide); PEI, polyethylenimine; PPI, polypropylenimine; RRM2, ribonucleoside-diphosphate reductase subunit M2; PLK1, polo-like kinase-1; EG5, eglin 5; GFP, green fluorescent protein; EGFR, epidermal growth factor receptor; GADPH, glyceraldehyde-3 phosphate dehydrogenase; SC, subcutaneous; NP, nanoparticle; IT, intratumoral.