CXCR4 and myocardial infarction: Thackeray and coworkers reported on the use of CXCR4-targeting PET probe [68Ga]PentixaFor in a murine MI model, demonstrating increased uptake in area of ischemic injury 3 days after the acute event, followed by dissipation of the biomarker signal at day 7, which was also correlated to leukocyte infiltration determined by flow cytometry 20.