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DIC analysis of synergid cell death and pollen tube position. A to C, Three optical sections of a female gametophyte showing two persistent synergid cells and a pollen tube within the micropyle. D, An ovule with a degenerating synergid cell. Abbreviations: cn, central cell nucleus (secondary nucleus); dsc, degenerating synergid cell; en, egg cell nucleus; pt, pollen tube; sn, synergid cell nucleus; zn, zygote nucleus. Scale bars: 5 μm.
