title: Sirenids: a family of polyploid urodeles?
mesh_terms: D000818:Animals; D005075:Biological Evolution; D002467:Cell Nucleus / Q000032:analysis; D002875:Chromosomes; D004247:DNA / Q000032:analysis; D007621:Karyotyping; D008297:Male; D011123:Polyploidy; D013045:Species Specificity; D013094:Spermatozoa / Q000166:cytology; D014562:Caudata
chemical_list: D004247:DNA