ABCC6 and Pseudoxanthoma elasticum: Necropsy of the homozygous asj mice revealed extensive mineralization affecting dermal sheath of vibrissae, an observation we have previously made in Abcc6tm1Jfk knockout mice (designated hereafter as the Abcc6−/− mouse), a model for another ectopic mineralization disorder, pseudoxanthoma elasticum (PXE) [8].