Possible embryonic origin of sleep interstrain differences in the mouse.
D000818:Animals; D002940:Circadian Rhythm; D008285:Major Histocompatibility Complex; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains / Q000196:embryology / Q000502:physiology*; D012890:Sleep / Q000502:physiology*; D013045:Species Specificity