title: Fine structure of excystment of the quadriflagellate alga Polytomella agilis.
mesh_terms: D002454:Cell Differentiation; D002473:Cell Wall / Q000648:ultrastructure; D056890:Eukaryota / Q000166:cytology / Q000648:ultrastructure*; D008854:Microscopy, Electron; D008858:Microscopy, Phase-Contrast