Vasohibin is an endothelium-derived negative feedback regulator of angiogenesis. The 365 aa, 44kD human Vasohibin shows 93% aa identity with mouse Vasohibin. Vasohibin has no canonical signal sequence, but the full-length form is only associated with cells, while N-terminally cleaved, active 42kD and 36kD forms are both cell-associated and secreted. Minor amounts of C-terminally cleaved 27kD form are inactive and lack the C-terminal heparin-binding basic domain. Vasohibin expression is upregulated by VEGF and FGF2, but this can be modulated by IL-1, TNFalpha or IFNy.