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Differences in in vitro pollen germination between freshly opened flowers of roGFP2 and cad2-1/roGFP2. The primary axis (on the left and with bars) shows the elongation of the pollen tube during in vitro pollen germination. The secondary axis (on the right and with lines) corresponds to the percentage pollen germination measured at the different times of germination. a and b indicate statistical significance at P≤0.01 and P≤0.05, respectively.
