SDS-PAGE of apoplast from Desiree leaves treated with BABA. Separation on a SDS-PAGE gel, showing apoplast proteins extracted two days after treatment with BABA in cv. Desiree. From left: control plant treated with water, plant treated with 10 mM BABA and plant treated with 1 mM BABA. The ladder used was Page Ruler™ Plus Prestained Protein Ladder (SM1811, Fermentas).