Kaplan-Meier estimates for expression levels of (A) Jag1, (B) Jag2, (C) Dll1, (D) Dll4, (E) Notch1 and (F) Hes1 divided into two groups above (lower, solid line) and below (higher, dotted line) the median value. Jag, jagged; Dll, delta-like protein; Hes1, hairy and enhancer of split-1.