Supplemental Figure S1. Mascot search results provided by the Yale Cancer Center Mass Spectrometry Resource and the W.M. Keck Foundation Biotechnology Resource Laboratory. Purified SacRALF1 peptide was trypsin digested and analyzed by LC MS/MS (Waters Q-Tof Ultima mass spectrometer). Cysteines were carboxamidomethylated in the protein prior to digestion.