Mutations in PEPR1 or At1g17750 do not rescue shedding in nev flowers. (A) Diagrams of the predicted PEPR1 and At1g17750 proteins, with the sites of the T-DNA mutations indicated by arrowheads. The regions corresponding to the signal peptide (S), leucine-rich repeats (LRRs), transmembrane domain (TM, and kinase domain (KD) are indicated. (B-E) Floral organ shedding occurs normally in pepr1 (B) and At1g17750 (D) mutant flowers (stage 17), but is blocked in nev pepr1 (C) and nev At1g17750 (E) flowers (stage 17).