A novel bHLH-PAS factor with close sequence similarity to hypoxia-inducible factor 1alpha regulates the VEGF expression and is potentially involved in lung and vascular development - Ema, M; Taya, S; Yokotani, N; Sogawa, K; Matsuda, Y; Fujii-Kuriyama, Y (Proc Natl Acad Sci U S A, 1997)