Steap subcellular localization. Colocalization of epitope-tagged Steap family members with Tf and endogenous TfR1. (A) Steap1, (B) Tf, (C) Tf-Steap1 merged; (D) Steap1, (E) TfR1, (F) TfR1-Steap1 merged; (G) Steap2, (H) Tf, (I) Tf-Steap2 merged; (J) Steap2, (K) TfR1, (L) TfR1-Steap2 merged; (M) Steap4, (N) Tf, (O) Tf-Steap4 merged; (P) Steap4, (Q) TfR1, (R) TfR1-Steap4 merged.