C shows a magnified
image of the highlighted field, which shows immunolabeled A. citrulli cells in the PE envelope (P) and in the intercellular spaces of parenchyma tissue of the
cotyledons (c). White arrows in D show the localization of A. citrulli cells in the PE layer. Bar (100 μm) in A is also applicable to C. Bar (100 μm) in B is
applicable to D