Abstract: The present invention is directed to a probe for detecting a transition metal, the probe comprising: a metal chelating portion configured to coordinate with a transition metal; a label portion configured to be detectable; and a linker bound to both the metal chelating portion and the label portion, wherein the linker is configured to react with a nucleophile when the metal chelating portion coordinates with the transition metal, as well in vivo and in vitro methods and uses thereof.

Abstract: The present invention relates to methods of detecting neurodegenerative diseases or disorders, particularly to methods for early detection of neurodegenerative diseases, such as Parkinson's disease. The present invention provides a method for detecting a neurodegenerative disease in a subject, the method comprising testing the subject for an indicator of release of neuromelanin from cells in the brain, wherein a positive test is indicative of death of brain cells containing neuromelanin and is characterised by an elevated level of the indicator of release of neuromelanin compared to control values.