part of life cycle stage embryonic stage Theiler stage 01 0.44999998807907104492 E0-2.5 Theiler stage 1 zygote stage mouse_developmental_stage EMAPA:TS01 XUO:0000045 TS01 (E0-2.5) "Starts the mouse development sequence, range from embryonic age 0-0.9 dpc (day post coitum). Assumes that fertilization takes place around midnight during a 7pm to 5am dark cycle. Noon of the day on which the vaginal plug is found the embryos are aged 0.5 d.p.c (days post coitum)." [http://php.med.unsw.edu.au/embryology/index.php?title=Mouse_Stages#Timed_Pregnancy "adapted from"] MmusDv:0000003 Embryonic stage defined by a one-cell embryo (fertilised egg) with zona pellucida present. UBERON:0000106