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Ultrasound elastography can quantitatively assess biomechanical properties of the placenta in conditions where placental function is compromised.The Cu-catalyzed click conjugation of an azide-functionalized vitamin B12 (cobalamin) and an alkyne-labeled 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) led to the formation of a highly stable fluorescent BODIPY-labeled vitamin B12 (λex/λem = 495/508 nm). The formation of what has been identified as an iodine adduct of the conjugate was also observed as a side-product during this reactio