Heterochromatic nature of W chromosome in birds.
D000818:Animals; D001717:Birds; D002645:Chickens; D010856:Columbidae; D004372:Ducks; D005260:Female; D006570:Heterochromatin / Q000032:analysis*; D006651:Histocytochemistry; D008722:Methods; D008938:Mitosis; D012730:Sex Chromosomes / Q000032:analysis*
D006570:Heterochromatin