title: Morphological observations on the nucleolus of cells in tissue culture, with special regard to its composition.
mesh_terms: D000818:Animals; D002466:Cell Nucleolus; D002875:Chromosomes; D005347:Fibroblasts / Q000166:cytology; D006367:HeLa Cells; D006801:Humans; D066298:In Vitro Techniques; D008854:Microscopy, Electron; D008858:Microscopy, Phase-Contrast; D011200:Poultry; D013194:Staining and Labeling