title: On the significance of tetrahedral tetrads of Precambrian algal cells.
mesh_terms: D005075:Biological Evolution; D000460:Chlorophyta / Q000166:cytology; D056890:Eukaryota / Q000166:cytology*; D005580:Fossils; D008540:Meiosis; D008938:Mitosis; D010163:Paleontology