MYH9 and coronary artery disorder: Calcium signalling was also identified as a significantly enriched canonical pathway in the comparision of the LV phosphoproteome of samples taken pre-ischaemic cardioplegic arrest, driven largely by changes in expression of isoforms of myosin heavy chain such as MYH9 and MYH11, both of which are significantly underexpressed in AVS patients compared to CAD patients.