title: Hydroxyurea: morphological effects on the macronucleus of Tetrahymena.
mesh_terms: D000818:Animals; D002455:Cell Division; D002466:Cell Nucleolus / Q000648:ultrastructure; D002467:Cell Nucleus / Q000187:drug effects / Q000648:ultrastructure; D002843:Chromatin / Q000187:drug effects; D006918:Hydroxyurea / Q000494:pharmacology*; D008856:Microscopy, Fluorescence; D013194:Staining and Labeling; D013769:Tetrahymena pyriformis / Q000187:drug effects* / Q000648:ultrastructure
chemical_list: D002843:Chromatin; D006918:Hydroxyurea