23 immunological markers involved in PHID, plotted on the first two Principal Components (PC). ALTADIH Cohort, 2007-2010. Immunological markers are well represented by the component when they are far from the center and close to the corresponding axis. Two markers are: 1) positively correlated if close to each other; 2) not correlated if in a rectangular position; 3) negatively correlated if on the opposite side.
Picat et al. BMC Immunology 2014 15:13 doi:10.1186/1471-2172-15-13