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Tissue printing to localize LeEXP4 mRNA expression. Tomato seeds imbibed for 24 h were bisected and the cut surfaces were printed onto two membranes. One membrane (left) was hybridized with an antisense probe for LeEXP4 and the other one (right) was hybridized with the corresponding sense probe as a control for non-specific binding. LeEXP4 mRNA was detected only in the endosperm cap tissue.
