title: DNA synthesis in the early embryo of the nematode Ascaris suum.
abstract: We have used microspectrofluorimetry to measure the rate of DNA synthesis in the first two embryonic cell cycles of the parasitic nematode Ascaris suum. The S-phase of the early Ascaris cell cycles occupies at most 1 hr; G2 phase is prominent and occupies approximately 11 hr; no G1 phase could be detected. These results contrast with our previous measurements made with embryos of the free-living nematode Caenorhabditis elegans, in which the earliest cell cycles consist of simple alternations between S and M phases.
authors.affiliation: Department of Medical Biochemistry, University of Calgary, Alberta, Canada.
authors.forename: M
authors.initials: M
authors.lastname: Azzaria
authors.forename: J D
authors.initials: JD
authors.lastname: McGhee
mesh_terms: D000818:Animals; D001200:Ascaris / Q000378:metabolism*; D004247:DNA / Q000096:biosynthesis*; D004625:Embryo, Nonmammalian / Q000378:metabolism; D005260:Female; D016193:G1 Phase; D016195:G2 Phase; D014158:Transcription, Genetic
chemical_list: D004247:DNA