GNA11 and phakomatosis pigmentovascularis: Specifically, postzygotic mutations in GNAQ have been found in extensive dermal melanocytosis, and mutations in GNA11 or GNAQ have been found in PPV types I, II (cesioflammea), IV, and V (cesiomarmorata), as well as the unclassifiable achromico-melano-marmorata type.