Comparison of Boolean implications with correlation. On human CD (clusters of differentiation) genes, this plot shows the histogram of different types of Boolean relationships. Blue, no relationships; green, low ⇒ high; red, high ⇒ high; cyan, high ⇒ low; magenta, equivalent; yellow, opposite.
Sahoo et al. Genome Biology 2008 9:R157 doi:10.1186/gb-2008-9-10-r157