“An international study, led by Macquarie University researchers Dr Edwin Lim and Professor Gilles Guillemin, has discovered the first blood biomarker – a chemical identifier in the blood – for multiple sclerosis , a debilitating disorder of the central nervous system that affects more than 23,000 Australians and 2.3 million people worldwide. The findings, which took 12 years to discover, will allow scientists to determine which type of MS a patient has with 85-90 per cent accuracy.