Mixing ability of mutations. For each focal pair of mutations (a, b), ..., (y, z), six tests of the sort a·br - b·ar were performed in order to test the relative mixing ability of component mutations a and b relative to a tester mutation r. A small amount of jitter has been added to the vertical coordinate of each point in order to facilitate visualization. Mixing abilities vary considerably between mutations, with the (y, z) comparison (last column) revealing the most significant difference in favour of y as the superior mixer to z.
Beerenwinkel et al. BMC Evolutionary Biology 2007 7:60 doi:10.1186/1471-2148-7-60