Heterochromatization in opossum, Didelphys virginiana.
D000818:Animals; D001345:Autoradiography; D002875:Chromosomes; D003582:Cytogenetics; D004261:DNA Replication; D005260:Female; D066298:In Vitro Techniques; D007962:Leukocytes / Q000166:cytology; D008297:Male; D008938:Mitosis; D009893:Opossums; D012730:Sex Chromosomes; D013936:Thymidine / Q000378:metabolism; D014316:Tritium
D014316:Tritium; D013936:Thymidine