title: Development and fine structure of angiosperm and gymnosperm sieve tubes.
mesh_terms: D001692:Biological Transport; D003593:Cytoplasm / Q000378:metabolism / Q000648:ultrastructure; D004721:Endoplasmic Reticulum / Q000378:metabolism / Q000648:ultrastructure; D008854:Microscopy, Electron; D010940:Plant Proteins / Q000032:analysis / Q000378:metabolism; D010944:Plants / Q000032:analysis / Q000378:metabolism* / Q000648:ultrastructure; D011134:Polysaccharides / Q000032:analysis / Q000378:metabolism
chemical_list: D010940:Plant Proteins; D011134:Polysaccharides