MGI:95415Mice homozygous for an ENU-induced mutation or a knock-out of isoforms 5 - 7 die during organogenesis and exhibit embryonic growth retardation. Mice homozygous for a knock-out of isoforms 1 - 4 are viable and fertile with no overt abnnormalities. Homozygous knock-out mice develop pulmonary venoocclusive disease, with pancytopenia, pulmonary hemorrhage and hypertension, and heart right ventricle hypertrophy.