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High Pressure Freezing and Freeze SubstitutionPathway of Pollen Tube GrowthNitrogenase CrFe ProteinPollen GrainsLate Late CarboniferousPeucedaneae DrudeAlpine Steppe SoilAlpine Grassland EcosystemPollen-specific cDNAGrowth of Large Single CrystalsHypocotyl CuttingDivision of BotanyFacultative CAM PlantPhellodendron Amurense RuprCharacteristics of PollenEmbryological EvidenceThree Gorges Reservoir RegionPollen-specific GeneDirect Driving ForceMale Gametophyte Development