In mid-2020, Mateos et al. (2020) reported on a biocompatible colloidal suspension of silver sulfide (Ag2S) NDs (hydrophobic radius of ∼10 nm) that displays peak NIR-II fluorescence emission (ca. 1,200 nm) following functionalization with the octapeptide angiotensin II (Ang-II), which is the natural ligand for the angiotensin 1 receptor (AT1R), for selectively targeting ischemic myocardial tissue (i.e., coronary thrombosis) for its real-time direct visualization in vivo via using NIRF imaging. Here, AGT is linked to coronary thrombosis.