FN1 and acute lymphoblastic leukemia: In addition, out of two infant and two adult MLLr leukemia cell lines assayed in the presence of Fn1 and/or Fbln1 (Fig. S8), only the infant MLL::ENL ALL cell line KOPN-8 showed a decrease in viability, which was attributed to Fn1 (Figs. 6J and S8B).